Which diode is more powerful than t6 or u2. XM-L T6 LEDs. Basic optical-electronic characteristics of Xlamp XM-L2 Cree

Which diode is more powerful than t6 or u2.  XM-L T6 LEDs.  Basic optical-electronic characteristics of Xlamp XM-L2 Cree
Which diode is more powerful than t6 or u2. XM-L T6 LEDs. Basic optical-electronic characteristics of Xlamp XM-L2 Cree

Hello. My next review will be devoted to things that I am very partial to. Namely, we will talk about the TangsFire C8 LED flashlight on the new CREE XM-L2 U3 LED from the Tmart store.

This flashlight is provided free of charge by Tmart.

The design of this flashlight will be discussed in great detail and of course you will see beamshots.

In short. The lantern is made of very high quality, gives a powerful, warm light. Only one point was found, which, in principle, is easy to fix. Well, in principle, you can leave it as it is. This is too insignificant.) For purchase - I recommend it.

If you are interested in this, then welcome to cat.


Let me start by saying that not all flashlights are created equal. It is better to use trusted stores. Because, as I read the reviews, and then decided to save money, a couple of times I bought flashlights not from the link from the review, but by finding them cheaper on the Internet. As a result, I got lights with “stars” that touch the body only with the edges, well, there is no platform under them for heat removal. And also with a lot of other jambs, ranging from scattered buttons to... But I will mention this in the review. Now I’ve become smarter.))) I’ll just say that this particular product can be safely purchased at Tmart. I cannot vouch for the quality of similar flashlights sold in other stores, given my bitter experience. So let's move on to reviewing this product.

First, the technical specifications from the seller’s website:

Specifications
Lumens 1300 Lumens
Power 8W
Bulb Quantity 1
Light Color White
Lightbulb Lifespan 100000 hours
Lighting Distance 100m
Runtime Battery decides
Switch Type Clicky
Switch Location Tail
Lens Coated Glass Lens
Reflector Aluminum Smooth / SMO Reflector
Material Aluminum
Color Black
Dimensions (6.14 x 1.73 x 1.06) " / (15.6 x 4.4 x 2.7) cm / (L x Head Dia.x Body Dia.)
Weight 6.74 oz / 191 g
Battery 1 x 18650 Battery (not included)
Voltage 3.6 - 4.2V
Lanyard Yes
Modes 5
Mode Arrangement Hi > Mid > Lo > Strobe > SOS

He came to me quite quickly

Was packed in a standard yellow bag with bubble wrap:

Package





And here is the lantern in front of me. There is no company name on the case, only the brand of the LED is applied:

We weigh:

Dimensions of the flashlight in comparison with a protected 18650 battery:

Let's get to the fun part, disassembling the lantern to find out if everything is done correctly.

Unscrew the tail in which the button is located. The button is not tactical:

Let's see what's inside her.

Everything was done perfectly. The parts fit together, there are no complaints.

Let's put the button back together and look at the flashlight body. And we will see the small flaw that I talked about at the very beginning. On the thread, on the side of the button, there is a rubber O-ring of slightly smaller diameter than necessary. This can be seen by the free space in the groove. When screwing the button, the O-ring feels a bit small:

And on the side of the “head” of the lantern, the sealing rubber is already as needed:

In principle, despite the insufficient thickness of the O-ring, the lantern should not lose its seal, even in heavy rain. I got hit with one of these today. Everything inside remained dry. But if, say, for example, you drop a flashlight into the water, I cannot guarantee that water will not get inside, even if only a little. But it’s not difficult to replace the rubber band; of course, this may be a feature of my flashlight. But I decided to leave it the way it is. Moreover, at home there is a full-fledged underwater lamp. And, as I already wrote, the flashlight withstood the test of the rain with dignity. From other stores, sometimes they arrived without any O-rings, this is what I mentioned at the beginning, about the unequal usefulness of the flashlights...

Let's now move on to disassembling the “head”.

Unscrew the “crown” and remove the glass. Glass is just glass! This is how the pun turned out. The glass is firmly sealed with a rubber seal located in the crown.

We take out the reflector made of aluminum:

On the thread of the “head” of the lantern, where the “crown” is screwed, there is also a rubber o-ring:

Let's look inside the "head":

Unscrew the nut on the “pill”:

And we get to the driver. This is the first time I've seen one like this.)) The driver provides 5 operating modes. Maximum, average, minimum, fast strobe and SOS signal. The driver is without memory, it starts up starting from the maximum mode.

The "head" of the lantern is completely disassembled. There is absolutely nothing to complain about. The star with LED is glued to the base with hot glue. Smooth and neat.
Putting the lantern back together. At the same time, coat the threads and rubber seals with silicone grease. Initially she was absent.

However, very few lanterns have it from the start. Therefore, I don’t consider this a disadvantage.

All carvings are done very carefully. There are no chips or sharp edges. All parts of the lantern fit tightly and without backlash. This is a big plus.

The disassembly of the lantern is complete. Let's move on to measuring currents.

Maximum mode:

Medium mode:

Minimum mode:

Let's move on to testing the flashlights.

The testing involved 4 flashlights that came to my hand not from the “zooms”:

1. TangsFire C8 on a CREE XM-L2 U3 LED (the hero of our review from the Tmart store).
2. Bright beam G20 Gryphon on CREE XM-L T6 LED
3. Fenix ​​TK21 on CREE XM-L U2 LED
4. UltraFire S6 on CREE XP-E Q5 LED

All lights are powered by 1 18650 battery.

Bimshots were shot once, without takes. It was drizzling lightly in the morning and I didn’t want to get the DSLR wet. Therefore, as it is. They give a sufficient idea of ​​the brightness of the lanterns. Although they look darker than in reality. If I had time, I could have played around with the aperture and shutter speed (I shot beam shots for the first time at fifty dollars), but after the first take it started to rain. But the lantern will participate in lantern events more than once and the review will be supplemented in the future.

So, shooting parameters: ISO 200, shutter speed 1 second, aperture 8. Distance to the fence is approximately 30 meters:

Now let’s evaluate hotspots and side illumination of the lights. The camera parameters are the same, the distance from the lamp to the wall is 2 meters:

Well, the results. The TangsFire C8 flashlight provided by Tmart is the brightest flashlight presented in this review. And the brightest one I have is not a “zoom”. It also gives the warmest light of any flashlight available. Therefore, it does not distort color rendition at all. In the light of a lantern, all objects have a natural color.

I really liked the lantern. It will probably become my everyday flashlight. I love it when it shines brightly.))) Therefore, quite sincerely, I recommend it! A well-made flashlight with a modern LED. Very good price-quality ratio. Let me say goodbye with this, to be continued...

I'm planning to buy +23 Add to favorites I liked the review +32 +47

Finally got around to CREE LEDs. An assignment was received to test LEDs from the Xlamp XM-L and XM-L2 Cree family. The material is large, since there are a lot of LEDs from this family, I decided to stop at two copies - neutral white U2. Therefore, if you don’t want to read a lot of letters, you should go straight to the end of the article and see how each of the tested samples of the CREE XM-L and XM-L2 family shines. Well, for those who want to look at the characteristics of CREE, you will have to be patient. Translated the main characteristics of Datasheet CREE XM-L and XM-L2 into Russian. Perhaps it will be useful to someone.

I do not exclude some erroneous points, so I ask you to be lenient and point out controversial points in the comments. Such issues will be studied and corrected as the truth is established.

Technical characteristics of Xlamp CREE XM-L LEDs

The technical characteristics of Xlamp CREE XM-L offer a unique combination of high efficiency with high current and small chip size. We can get about 1000 lumens with an efficiency of over 100 Lm/W at 3A and 5mm*5mm sizes. Compared to the XP-G line of LEDs, they are 20 percent stronger.

Most often, XM-L is used in the design of basic lighting for offices and shops, indoor illuminated advertising and roadway lighting (in lanterns).

It is due to the unique characteristics, in particular high luminous efficiency, that we can significantly reduce the cost of the entire lighting structure, because we will need fewer LEDs and can save on optics.

According to color characteristics, they can be divided into warm white, cool white and neutral tones. But the color rendering here is not much worse. In particular, from standard color rendering to CRI 90, only warm white options are available. Neutral and cool can only be purchased with a standard color rendering index.

CRI Color temperature (K)
Warm white 2700-4000 Neutral white 3700-5000 Cool white 5000-8300
Standard + + +
Min 80 +
Min 85 +
Min 90 +

Main characteristics of Datasheet in Russian Xlamp XM-L Cree

Characteristics Unit Minimum Standard Maximum
Thermal resistance, transition to solder point (chip/substrate) °C/W 2,5
Viewing Angle (FWHM) Hail. 125
mV/°C -2,1
IN 8000
Maximum current mA 3000
Reverse voltage IN 5
IN 2,9 3,5
IN 3,1
IN 3,35
°C 150

Main optical-electronic characteristics of Xlamp XM-L Cree LED

Let’s not go into too much detail and look only at the most important things from the datasheet on the Xlamp XM-L Cree LED. Everything has been translated and no additional explanation is required. Everything is clear and simple.

Optoelectronic characteristics of Xlamp XM-L Cree

1 of 3


Dependence of luminous flux on temperature transition at 700 mA



Change in brightness by current

For those who find this data not enough, they can safely go to the official Cree website and find the official pdf file. But, as they say, this is for particularly inquisitive minds. For everyone else, I have already presented everything here).

Characteristics of light output at a thermal transition of the crystal up to 25 degrees. Flux Characteristics (TJ = 25 °C) XM-L

Color Color temperature, K Min. light output at 700 mA Calculated light output data (Lm) Code
Min Max Group Lumen 1000mA 1500mA 2000mA
Cold white 5000 8300 T5 260 360 511 643 XMLAWT-00-0000-0000T5051
T6 280 388 551 692 XMLAWT-00-0000-0000T6051
U2 300 416 590 742 XMLAWT-00-0000-0000U2051
Neutral white 3700 5000 T4 240 332 472 593 XMLAWT-00-0000-000LT40E4
T5 260 360 511 643 XMLAWT-00-0000-000LT50E4
80 CRI white 2600 4300 T2 200 277 393 494 XMLAWT-00-0000-000HT20E7
T3 220 305 433 544 XMLAWT-00-0000-000HT30F7
Warm white 2600 3700 T2 200 277 393 494 XMLAWT-00-0000-000HT20E7
T3 220 305 433 544 XMLAWT-00-0000-000HT30F7
85-CRI white 2600 3200 S4 164 227 323 406 XMLAWT-00-0000-000PS40E7
S5 172 238 338 425 XMLAWT-00-0000-000PS50E7
S6 182 252 358 450 XMLAWT-00-0000-000PS60E7
90 CRI white 2600 3200 S4 164 227 323 406 XMLAWT-00-0000-000PS40E7
S5 172 238 338 425 XMLAWT-00-0000-000PS50E7
S6 182 252 358 450 XMLAWT-00-0000-000PS60E7

Cree reserves the right to change the luminous flux +- 7 percent

For cool white (5000K-8300K) CRI = 65

For neutral white (3700K-5000K) CRI = 75

For warm white (2600K-3700K) CRI = 85

The minimum CRI for 80-CRI White is 80

The minimum CRI for 85-CRI White is 85

The minimum CRI for 90-CRI White is 90

All light output calculations at 1000, 1500 or 3000mA are for reference only. The company cannot provide any exact data. In my deep feeling, this is all due to the fact that these chips should not be “driven” at such currents. The brightness may be good, but degradation will occur quite quickly due to excessive heating. And the use of large radiators for such chips is inappropriate, since the final cost of the light source design will increase.

The next sample that we will look at is the Xlamp XM-L2 Cree LED. From the name it is clear that this is an improved example of the first execution.

Main technical characteristics of Xlamp XM-L2 Cree LED datasheet in Russian

Characteristics Unit Minimum Standard Maximum
Thermal resistance, transition to solder point (chip/substrate) °C/W 2,5
Viewing Angle (FWHM) Hail. 125
Temperature voltage coefficient mV/°C -1,6
ESD withstand voltage (HBM per Mil-Std-883D) IN 8000
Maximum current mA 3000
Reverse voltage IN 5
Applied voltage (@ 700 mA) IN 2,85 3,15
Applied voltage (@ 1500 mA) IN 3,05
Applied voltage (@ 3000 mA) IN 3,3
Possible LED operating temperature °C 150

Basic optical-electronic characteristics of Xlamp XM-L2 Cree

Optoelectronic characteristics of XM-L2 Cree

1 of 3


Dependence of illumination on thermal transition


Current versus voltage


Dependence of lighting on current

Characteristics of light output during thermal transition of the crystal up to 25 and up to 85 degrees. Flux Characteristics (TJ = 25 and 85 °C) datasheet

This table will allow us to understand how different the light characteristics of the Xlamp XM-L and XM-L2 Cree are. According to official data from Cree, second-generation LEDs are almost 20 percent brighter. Judging by the calculations, 20 percent doesn’t even smell there. Maximum 12-15 percent. But even for this percentage, it’s a fairly good “movement forward.”

Overall dimensions of Xlamp XM-L and XM-L2 Cree LEDs according to datasheet

I won't tell you anything new. I liked that, unlike their Chinese counterparts, the sizes here are really kept under tight control and it is impossible to find deviations in any batch. Having rummaged through the Internet, I realized that this is monitored by a special quality control line in production. It's a pity that many Chinese don't have this)). But even from them you can find quite good specimens, but you can’t guess the size.

Comparison of Xlamp XM-L and XM-L2 Cree LEDs

For a proper visual comparison, photographs of two identical Xlamp XM-L and XM-L2 Cree U2 LEDs were taken. With our eyes we can only see the absence of vertical “stripes” on the second generation. Instead, if you look closely, you can see dots. The connection also became two-wire instead of three-wire. Cree XM-L2 are 20 percent brighter. Which I highly doubt. And at the same temperature transition they provide much more light.

In reality, whether this is true or not - let it remain on the conscience of the manufacturers, but what we actually have - now let's see, having powered the diodes with the same voltage and current. Naturally, the modernized one will be brighter, but we’ll see by how much.

In this test we see that the XM-L2 actually shines brighter. At 700 mA we got 343 and 307 lumens. A big number in favor of the upgraded LED. We did this test using a dark room and directly a “bare” neutral white LED.

To fully understand what the difference is in real life, we will use flashlights of the same model in order to minimize the difference in visual perception. The lenses for both flashlights are the same.

Conclusion after comparison of technical characteristics and comparison of Xlamp XM-L and XM-L2 Cree

I think everything is clear without words. Both in terms of characteristics and in fact, the second generation diode shines an order of magnitude better. About 20 percent is overestimated, of course, but we win our 12-15 percent. In terms of heating, there are also slight improvements. In everything else, we need to understand it more carefully. But our task was to look at the characteristics and compare the Xlamp XM-L and XM-L2 Cree LED family.

Finally, we will publish a table to quickly determine the light output of one and another type of chip.


Light output comparison table between Cree Xlamp XM-l and XM-L2

An American company with a thirty-year history produces the best semiconductor products. The Cree XM-L T6 LED is one of the most popular models in the range of high-power LEDs. Since its introduction in 2011 until now, it has been the company's best-selling LED. All this is thanks to its performance and quality.

Advantages of XM-L T6

The cree xm-l chip has the shape of a square with sides of 5x5 mm, and is located on a green substrate. This distinguishes it from previous and new generations of LEDs, the substrate of which is gray. The LED is protected from above by a transparent layer with a radius of about 3 mm. The main advantage of an LED is its luminous flux, the values ​​of which vary depending on the color temperature.

Thermal resistance value is about 2.5°C/W. The aluminum heat sink substrate can be star-shaped with a diameter of 20 mm, or round with recesses with a diameter of 16 mm. The thickness of the substrate is 2 mm.

Main settings

The dimensions of the LED are not very large, especially considering its glow parameters.

LED Dimensions

The main parameter of Cree XM-L is luminous flux. For the T6 model, the minimum luminous flux value is 280 lm. In this case, the current is 0.7A. When the current increases to 1 A, the minimum luminous flux will be 388 lm, respectively, at 1.5 A - 551 lm, at 2A - 692 lm.

These data were obtained theoretically; in practice, normal operation is guaranteed at a nominal current value of 700 mA.

The voltage drop does not exceed 2.9 V. The dispersion angle is 125°. The color rendering index ranges from 80 to 90 Ra. The figure below shows the current-voltage characteristic at normal ambient temperature.

I-V characteristic of Cree XM-L T6 LED at normal temperature

The following graph shows the relative drop in luminous flux as the temperature increases to 150°C

CVC of Cree XM-L T6 LED at a temperature of 150 degrees

Detailed Specifications

The luminous flux of cree t6 depends on the color temperature; for this, a characteristic is introduced - the LED bin. If we consider the specified model, then there are 8 bin options. They are designated by a number and a Latin letter, for example, 0D, 2A,3B and so on. A bin corresponds to a certain color temperature with a permissible deviation. For example, Cree XM-L T6 4C will have a neutral white tint. The manufacturer provides kits with different bins, because it is technologically impossible to select a specific one. There are 6 standard delivery sets, 5 of which are cool white, and 1 is neutral. The original packaging always indicates the kit code 50, 51, 53, E1, E2 or E3. In addition to cree t6 wc, there are 14 more groups in the XM-L series. The minimum luminous flux and the most yellow tint will be in group S4, and the maximum and, accordingly, violet tint will be in group U2.

What driver is needed for this LED?

The maximum brightness of the LED and the number of operating modes depend on the selected driver. A typical Cree XM-L T6 LED driver should meet the following parameters:

  • nominal input voltage – 4.2 V;
  • Output current up to 3 A.

The purpose of the device is to provide stabilization of the output current within narrow limits. This guarantees reliable glow and long service life. Often the driver characteristics provide 5 operating modes of different power. But there are options. The video shows a diagram of how to assemble the driver yourself.

A cheap microcontroller, MOSFET, resistor and capacitor are used.

Where are XM-L T6 LEDs used?

This type of LED has become widespread in many areas, this applies to both external and internal decorative lighting. But the most popular product made on the basis of this semiconductor device is the UltraFire E17 handheld flashlight.

Flashlight UltraFire E7 with CREE XM-L T6 LEDs

Many of the undeniable advantages of the product are related to the fact that it uses a high-quality LED that provides operation for about 100 thousand hours. The design of the flashlight itself involves focusing the light flux using the sliding part of the body. Power comes from batteries or accumulator. The driver installed here is designed for 5 operating modes: maximum power, medium, weak, strobe and SOS.

To sum it up, we can say that the Cree XM-L T6 is one of the most popular in the line of ultra-bright LEDs. The design of the star substrate provides the best heat dissipation, which is an important parameter for powerful devices, because with overheating the LED loses light output. Quality and service life are guaranteed by a well-known American brand.

Cree, which produces the XM-L T6 LED, is one of the leading manufacturers of lighting devices. Unfortunately, it does not have an official website in Russia, so there is little information about these products. The T6 LED has very good technical characteristics, therefore it is actively used by various manufacturers of lighting devices. In most cases, the following products are made based on these diodes:

  • battery-powered flashlights;
  • lamps for vehicles;
  • LED beams for ambulances, police and other special equipment;
  • side lights, headlights with low and high beam.

Main technical characteristics

A distinctive feature of the branded Cree T6 LED diodes is the green heat-dissipating substrate, on which there is a 5 × 5 mm crystal. The case is hemispherical, made of transparent heat-resistant plastic, with a height of 3.2 mm, providing an irradiation angle of 125 ̊, operating current 700 mA, voltage 2.9 V.

The end result in designing any LED is to achieve the desired level of luminous flux. According to experimental measurements carried out by Cree, at a current of 700 mA and a room temperature of 25 °C, the following results were obtained:

According to the company's standards, the entire emission spectrum of the LEDs they produce is divided into nine intervals (groups), each of which is assigned a designation. The spectrum intervals are graded by temperature in degrees on the Kelvin scale. Consumers are more in demand for diodes of the T6 group - this is a white cold light with a flux power of 280 lm at an operating current of 700 mA. All groups have a luminous flux power from 164 lm (group S4) to 300 lm (group U2).

The ambient temperature has a great influence on the luminous flux; this is clearly seen from the graph of the dependence of the luminous flux intensity on temperature.


As the ambient temperature increases, the magnitude of the forward current and, accordingly, the brightness of the light flux decreases.


During operation and numerous experimental measurements, it was noticed that when the crystal is heated to 75°C, the radiation intensity decreases to 10% relative to the brightness at an ambient temperature of 25°C.

Review of individual lighting devices based on Cree XM-L T6 LEDs

One of the successful product options based on the Cree XM-L T6 diode is the UltraFire E17 flashlight. Let's consider the positive aspects, as well as the disadvantages and possibilities for eliminating them.


The main advantage of the design of this flashlight is the presence of a powerful Cree XM-L T6 LED, a lens and a sliding housing design, which allows for focusing (ZOOM) of the light flux. The case is aluminum, under the dispersive lens there is a board, on the outer side of which there is an LED, and on the reverse side there is an electronic circuit that converts the parameters of the current and voltage of the power source.


AAA batteries are used for power; with an additional sleeve, you can install 18650 batteries. Chinese manufacturers claim a luminous flux of 2,000 lm. Based on the luminous flux power table provided by the manufacturer Cree, these data are not credible even taking into account the focusing of the luminous flux through the lens.

The operating life of the LED is 100,000 hours, this can be believed if you take into account the operation of the flashlight without overheating the LED crystal. But the design does not provide a good heat sink for heat removal. The LED is located on a textolite board. With prolonged use, the diode inside the housing will inevitably heat up, which will cause a decrease in the intensity of the luminous flux. A diode mounted on an aluminum heat-sinking substrate, with its ends tightly adjacent to the body, would heat up significantly less. This would improve the quality of the luminous flux and the life of the flashlight.

Consumers measured the UltraFire E17 illumination at a distance of 1 m and obtained the following results:

Luminous flux in various modes of the UltraFire E17 flashlight

At a distance of 10 cm, the luminous flux without a lens was 5,800 lm, through the lens 10,000 lm. Overall, the flashlight is not bad, but as always, Chinese products have exaggerated technical characteristics and require some modifications for reliable, long-term operation.

The UltraFire XM-L T6 flashlight has more modes:

  • maximum light;
  • average;
  • weak;
  • strobe;

UltraFire Cree with XM-L T6 has slightly improved performance - the board has a metal heatsink that is in close contact with the case. Sometimes these lights are equipped with an XML-U2 LED, it is more powerful, this only improves the characteristics of the luminous flux.

The CREE company is one of the market leaders in the production of LEDs. One of the most popular are the powerful diodes of the Xlamp series. Bicycle headlights and compact powerful flashlights are made on the basis of CREE XM-L2.

Cunning Chinese sellers especially like to put the CREE mark on their products; the presence of such an inscription greatly increases the level of sales. After all, the majority of buyers will not be able to distinguish a real Cree from a fake one, they will not even be able to compare the luminous flux; bright light is already good. But if there were no KRII inscription, then there is a high probability that you would have bought something else that would justify the trust placed in it.


  • 1. Main parameters of CREE XM-L2 U2 and U3
  • 2. How to distinguish original from fake
  • 3. Detailed characteristics of U2 and U3
  • 4. Results

Main parameters of CREE XM-L2 U2 and U3

For those who do not particularly understand technical documentation, I will compile a table of the main parameters. Also, do not confuse the Cree XM-L and XM-L2 series, they differ in color. For XML it is green, for XML2 it is silver. They may also slip you a very popular LED bin; it has slightly worse characteristics, but visually you will not notice the difference.

Parameter U2 U3
Luminous flux, Lumen 300-320 320-340
Power 2 W 2 W
Operating temperature, degrees -40 to + 85 -40 to + 85
Rated current, mA 700 700
Supply voltage, current 700 mA 2.85 Volts 2.85 Volts
Supply voltage, at current 1500 mA 3.05 Volt 3.05 Volt
Supply voltage, current 3000 mA 3.3 Volt 3.3 Volt
Length and width, mm 5 x 5 5 x 5
Angle of illumination, degrees 125 125
Color rendering index from 70 to 90 Ra from 70 to 90 Ra

How to distinguish original from fake

Super-bright LEDs are mainly used in expensive multifunctional flashlights, such as Ultrafire. For some flashlights, for example on Aliexpress, the Chinese indicate such high brightness as if they were using alien technology. To establish the true brightness, you need to find out its nominal luminous flux by the brand of the LED. In addition to lanterns with original elements, the Chinese sell a large number of lanterns with fake elements. A fake one may resemble the original one in appearance, but there is no exact similarity. Accordingly, its quality is lower and its service life will be much shorter, because they can fail prematurely due to low quality.

One of the easiest ways to determine that the Chinese are cheating is to look at the specifications (datasheet) for the original one and compare the sizes. As a rule, the fake one is larger in size in order to provide the necessary luminous flux. Compared to the original, it has fewer Lumens per Watt. Having purchased such a flashlight, you should not be upset, you simply received a product that corresponds to the amount spent.

Detailed characteristics of U2 and U3

Main characteristics

Kriya XML Parameter Table

Emission spectrum




Results

Regardless of the generation, this LED provides a very good luminous flux. If the seller asks for a considerable additional payment for the second generation, then you can safely kick him, he is trying to scam you out of money, since they have the same price, and the difference is only on paper.

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Reviews and questions, 40 comments

  1. Nikolay 15.09.2017

    Good day. I have such a dilemma that I have not eaten or slept for the second week... PETZL myo XP headlamp, which is already 7 years old. Power supply: 3 AA batteries. It contains a Seoul w42182 LED. The flashlight is programmable. At the highest power, 600 mA comes to the LED and then the amperes decrease depending on the program number. I really want to change the LED to a more powerful and efficient one, but in the general ocean of LEDs I can’t decide. Help, please, advise what is better. Thanks in advance for your answer.

    1. Expert answer 09.10.2017

      It depends on the driver parameters, you will have to increase the power on the LED.

  2. Anton Ivanovich 12.05.2017

    Hello, dear Sergey. Please answer. Is there such a car lamp for 6 and 12 volts with a CREE LED or with CREE LEDs, according to the characteristics it would be very bright, but at the same time the lamp would consume a minimum number of watts. Please, if you decide to answer , focus on such an indicator as the capacity of the battery, which is small, this is 5 ampere hours, the glow time of “good” light is 24 hours. I hope for a friendly answer. Sincerely, Anton Ivanovich.

    1. Expert answer 14.05.2017

      I don’t understand what kind of lamp you need and where it goes. Buy a Cree diode and driver.

  3. Vlad 16.01.2017

    What kind of (Miracle) Cree XML UV 395 nm LED is installed in flashlights. Bailong Police UV Headlamp BL-6866 I understand the color is warm white, white and cool white

    1. Expert answer 23.01.2017

      Ultraviolet LED, but most likely a fake LED, not the original Cree.

  4. Igor 02.01.2017

    Hello, Sergey, Happy New Year to you, I wish you good health, success, new knowledge, and acquaintances.
    I would like to ask you what kind of color temperature is 15000K. Here on Ali they sell a set of LEDs for growers and in the description there is a line wavelength: 10 pcs. 380nm~840nm/7pcs 660nm 3 pcs. 475nm/5 pcs. 15000 K 5 pcs. 460nm. When searching on Google, I find a lamp with CreeXLamp® XT-E and XP-E diodes with a temperature of 16000K (and even saw somewhere with the same 15000K), BUT CreeXLamp® XT-E and XP-E do not have a color temperature of 15000,16000K h . What do you think the Chinese mean by a color temperature of 15000K?

    1. Expert answer 10.01.2017

      15000 K is violet, blue. These are ordinary Chinese LEDs, there are no Cree ones there.

  5. Sergey 23.12.2016

    Hello. For underwater hunting you need a powerful flashlight with warm light, what do you recommend?

    1. Expert answer 25.12.2016

      I’d advise you to go to the “Fonaryovka” forum, they know better about flashlights.

  6. Mateo 16.11.2016

    There is an MTE sf23 flashlight on an ancient P7
    I want to change the driver and diode to a modern and warmer one. I use it mainly on my bike.
    What do you advise? Thank you.

    1. Expert answer 16.11.2016

      Install Cree as appropriate.

  7. Dmitriy 01.09.2016

    Sergey, help me with this problem. I bought a flashlight XGlow series E6, after the next charge I mixed up the polarity and as a result the LED burned out (it rings in both directions with a resistance of 10 ohms, a characteristic smell appeared), max. light output 625 lumens. The question is where can I buy such an LED, and what brand is it?

    1. Expert answer 01.09.2016

      Typically this is Cree XML T6. You can buy it in any online store; this is the most common LED.

  8. Alexey 15.08.2016

    Hello. Krii xm-l t6 worked for 3 years in the fog light of a car and then died the other day. I checked it with a tester. I think the reason is the shortcomings of the thermal paste.
    question: 1. Is it possible to change the chip yourself or take it with a radiator and farm it.
    2. where to buy (except Alli)
    3. How long will XM-L 2 U2 work on an old radiator from T6 at a current of 3A?

    1. Expert answer 17.08.2016

      1. The chip can be changed, but you need good equipment.
      2. You can buy it in domestic online stores.
      3. Depends on the size of the radiator and heating. Long is a relative concept, for some it takes 1000 hours in this mode.

  9. Nikolay 12.08.2016

    Tell me how to prove that the seller sent a fake? I bought a bicycle light on Ali which, according to the ad text, contains 2 x cree xml u3. When I unpacked it and turned it on, it shines like a child’s hand-held flashlight, I took it apart and there is no cree inscription on the substrate, and in general they are somehow nameless and double... two substrates together and only two contacts for two LEDs, i.e. the second one is soldered somehow from inside the substrate, unfortunately I can’t insert a photo of this miracle here, but Ali opened a dispute with the seller, help him how to correctly prove that the bastard is cheating.

    1. Expert answer 12.08.2016

      I am an expert in this; after my examinations, manufacturers usually begin to deal with Chinese factories. Write to me by email, it is in the “About Me” section.

  10. Kitaer 01.06.2016

    Everything is clear there

    1. Expert answer 01.06.2016
  11. Kitaer 01.06.2016

    Sergey, please read more about bins and don’t confuse people with your misconceptions.

    1. Expert answer 01.06.2016

      Write what you didn't like.

  12. Igor 25.04.2016

    Sergey, please answer. What is the difference between Cree XM-L2 and Cree XM-L2 U2 LEDs? I want to order a Nightcore HC-50 headlamp. The 2015 version has Cree XM-L2, the new 2016 version has Cree XM-L2 U2. Which one is better to take? Thank you in advance.

    1. Expert answer 26.04.2016

      U2 is the Cree XM-L2 LED bin. Another popular bin of this diode is “T6”. They differ by 20 lumens. It turns out T6 300 lumens, U2 320 lumens. The difference is insignificant and unnoticeable.

  13. Maxim Popovich 01.04.2016

    Dear! You are an expert. I've looked at a lot of reviews. Nobody understands. There are no specific tests for LEDs. I want to buy a flashlight, but I don’t know which LED is better, because there are no specific comparisons.
    Dear! What would you recommend based on your experience - C8 CREE XM-L2 U3 with a current of 3500 mA, or C8 CREE XP-L V5 with a current of 3000 mA. Or Convoy XM-L2 U2 1A 2800 mA.
    Which one is brighter, more powerful? long-range? What is your opinion? Please write to my email: [email protected]

    1. Expert answer 01.04.2016

      Compare the nominal luminous flux and find out the difference. They are similar in parameters, so the range of a rechargeable LED flashlight will depend on the optics of the flashlight.

  14. Andrey 27.03.2016

    Hello, can you please tell me which LED lamps for high and low beam will suit me? I have a two-compartment headlight Model Chevrolet Lumina APV 1992 edition Everyone complains that they initially have a bad factory light

    1. Expert answer 27.03.2016

      Look in the “Auto shop” section on my website, there are good low and high beam lamps there.

  15. Igor 18.03.2016

    “... Then each diode will give 600 Lumens. In total, 2 T6 LEDs will give 1200 Lm.
    It seems to me something (from a physics course) that light fluxes from various sources are not summed up, but are calculated as the square root of the sum of the squares of each source. Those. it will not be 1200, but 848. (Light still has particle-wave duality. And waves, as you know, cannot be summed up, because even if the waves are of the same frequency, but in antiphase, we will get 0 at the exhaust). But if the waves were coherent (with the same frequency and phase), then it would be possible to summarize

    1. Expert answer 19.03.2016

      There is no need to sum up the waves here, this is a stream of photons. For example, 1 diode produces 40 lumens. We turn on 2 diodes, we get 80 lumens.

  16. Dima 28.02.2016

    Hello, is the driver suitable for t6 to l2 u2?? if not, please advise the required power!!

    1. Expert answer 29.02.2016

      Will do.

  17. Sergey 23.12.2015

    Hello, what can you say about these light bulbs?

    1. Expert answer 23.12.2015

      Like copies of old Japs, the seller is lying about the luminous flux. One lamp is only 1200-1300 Lumens. Long outdated.

  18. Anonymous 04.11.2015

    I didn't expect to find the answer to my question (number 1) in this thread. Thank you Sergey!
    The beam shape of the Fenix ​​headlights is very good, as far as one can judge from the YouTube videos.
    You won't see another headlight like this for under $200.

    1. Expert answer 04.11.2015

      In fact, everything is standard if you know the specifications.

  19. Dmitriy 17.10.2015

    Hello Sergey!

    I also did some digging on the Cree website.
    If you follow the table with technical characteristics and believe that Cree is not lying, it turns out that, for example, U2 LEDs at 0.7 amperes will produce 300 lumens of illumination. Then what we get. Famous companies, for example Fenix ​​in the BT30 model, either lie with 1200 (1800) lumens, or use the driver to increase the current to more than 2 amperes (728+728 lumens)? We all know that there are two Panasonic 2900 (3100) mAh batteries inside. That is, if two LEDs work for 1 hour 50 minutes, as Fenix ​​indicates, then in the best case, each LED will require 1690 mAh, which is more than half the capacity of the original batteries. The question is, where does the extra hour of work come from?

    1. Expert answer 17.10.2015

      These diodes are described on my website. Everything is simple here.
      The Fenix ​​BT30 has two Cree XML-T6 diodes. It has a nominal output of 300 Lumens. With good cooling, the current can be increased up to 2 times. Then each diode will give 600 Lumens. In total, 2 T6 LEDs will give 1200 Lm.
      If the current is increased further, there will be significant degradation. In Turbo mode 1800 lm. The LED will work 10 times less. At nominal value it works for 30,000 hours. On double current 20,000 hours. In turbo mode 2,000 hours. Ask the flashlight manufacturer Fenix ​​about the extra hour of work.

  20. Andrey 03.10.2015

    Good day, Sergey. I have a big problem with the ThruNite TN30 flashlight. During disassembly, I accidentally turned the reflector and broke two TN30 LEDs (LEDs 3 x Cree XM-L U2, 2630 ANSI Lumens). I searched all over the Internet and couldn’t find where I could buy such a board with LEDs. Please give me some advice on what to do? Where can I buy such a board or buy LEDs separately? If you buy them separately from the board, the question arises - how to solder them. I’m not an expert in this matter, and I can’t find specially trained people in our city. I can send you a photo of the board with LEDs to your email. Help me please. With all respect, Andrew.

    1. Expert answer 06.10.2015

      It’s better to ask this question on the “Fonarevka” forum; they specialize in flashlights.