Similar LED to CREE XP-E

Try to use XP-E2 from IO. They have highest bin.
Also you can order them soldered to noctigon pcb and I think they can be easy overdrived to 1.5Amp in this way.

as said above get xp-e2 ,you will be fine up to 2.5Amps

Thank you for you reply.

I did know noctigon PCB before.
Does it really make the difference with classic star PCB because 3.99$ for one XP-E2 R4 it is a bit expensive for me.
We can found XP-E2 R3 on star PCB (no real brand) for about 1.50$.

In fact I need the same beam angle OR narrower. In other words XP-E die size or smaller like on XB-H (up to 5W).

The XP-E2 is as good as the brightest led for its size.

If you buy a R3 bin from a random seller, chances are very high that the bin is lower than that. Intl-outdoor com can be trusted for their bins.

If you don’t mind waiting another week (I’m on holiday now), I can reflow a R3 bin (0D tint) XP-E2 on a Noctigon for you (for free) and even remove the dome for an even smaller and brighter beam.

The best current would be around 2A, since you do not mention which flashlight it is in, I don’t know the driver size, so I can not recommend a driver.

Yes I can wait a week.
I don’t want to use it in a flashlight. The driver will not be directly at the back of the LED PCB.
It is to be used with a micro-controller. I’ve a constant current driver like this: http://www.aliexpress.com/item/New-5A-constant-current-LED-driver-module-battery-charging-constant-voltage-constant-current-DC-DC-power/32695299516.html?spm=2114.13010608.0.74.epX50s
I don’t know if I can force 2Amps with this driver or if it is a current limiter.

At 2Amps the LED will be very hot. is it not too difficult to cool it in a flashlight?

If you want more output maybe a dedomed XPG2 would be a good option. I’m not sure about the exact XPE2 die size, but I think a dedomed XPG2 might have a similar beam size to a domed XPE2 and depending on the current it would be significantly brighter also.

I forgot to tell why I said that 4$/pcs is too expensive for me.
It is because I need 8 or maybe 10 pieces.

The XP-G2 die is 2.2 tines as large, the maximum surface brightness is comparable to the XP-E2, so you get a bigger beam of the same brightness.

OK, thanks. Is that 2.2x the area? From the OP it sounded like keeping the beam size the same was important, and I assume he was using a domed XPE.

Flashlights running 2A (7W) get quite hot over time but they work fine.

Btw, reflowing 8-10 XP-E2’s plus dedoming is a different story, quite a project and I do not have that number of Noctigons.

I’ve told you that I currently use XP-E Q5 LED, but I’ve some doubts about it.
Picture of the LED:

I’ve a flashlight with a LED sold as a XP-E Q5 but the dome seems to be slightly smaller.

Do you recognize them?

Hello,

You don’t have any idea?

As XP-G2 LED has been suggested, I’ve checked for dimensions.
The die have a size of 1.4mm x 1.4mm against 1mm x 1mm for the XP-E.
However I think that a de-domed XP-G2 (or maybe XP-G3) could have a similar beam angle than a domed XP-E/XP-E2. What do you think about that?

If it can be similar (or narrower) I will try to find someone to make the dedoming process because I cannot do it myself.

Hi Yoann.

If those photos are from a cheapass SK68 clone, chances are that stuff doesn't even equips a genuine XP-E. Maybe some botchy mean-CRI CrappiceBlight…

In such a case, maybe this is what your're after, performance & economy wise:

Hope this helps my dear.

Cheers ^:)

Hello,

Thank you very much for that.
After some researches, XT-E seems to be quite similar to the XP-G2. Both have a dome radius of 1.53mm and both have an viewing angle of 115°. Thus I think that they have the same die size (I didn’t manage to find the die size of the XT-E). Tell me if I’m wrong.

If I’m right, the main difference is the output brightness.

In my previous post I spoke about XP-G3 but the die seems to be bigger than the die of XP-G2.

Regarding your links and other product on the website I do not understand some things.
For example on your second link:
https://www.fasttech.com/products/1609/10004538/4963402
There is a max lumens of 456.
But when I choose single piece (also XT-E R5-1A):
https://www.fasttech.com/products/1609/10004538/1347105
it is wrote 496Lm.
Why it is different. Moreover on Cree website it is wrote 629Lm
http://www.cree.com/LED-Components-and-Modules/Products/XLamp/Discrete-Directional/XLamp-XTE-White

Yoann, unfortunately FastTech is not known to provide consistently accurate information about their products. When I need specific product information I log in on their website and make an inquiry about the product, their customer service usually works nicely.

Regarding your doubts about the product, check this out:

  • XT-E R5 bin is 139-148 lumens at 350mA, 85º. At 1'5A luminous flux is ≈3'08 times that, thence 441'98 average lumens.
  • XT-E R2 bin is 114-122 lumens at 350mA, 85º. At 1'5A luminous flux is ≈3'08 times that, thence 363'44 average lumens.

629 lumens? Flashy numbers, yeah. Maybe possible on a bin unheard of, a higher driving current, smoking some crack, and/or any combination of the aforementioned…

And please bear in mind that, in practice, you may find yourself somewhat hard-pressed to say an R5 is noticeably brighter than an R2; you'll notice a difference, yet it won't be as noticeable as you may think to the naked eye. I'd take the warm whites, and of course some could argue it is a matter of personal preference but, I am not the first to say the reason for the higher vision comfort with warm/neutral white light is in some way related to the low temperature of the available light sources at night which mankind has evolved with: campfires, torches, etc.

Cheers ^:)

It seems that XT-E is a good tradeoff between a narrow beam and a bright beam.
The tint is not really a criterium of choice because it is not for a night vision but for a night lighting effect. It is why I looking for the narrower and brighter beam possible. Do you know which tint is the more visible into smoke or fog?
CREE XT-E should give me a larger beam than with XP-E because the dome is a bit larger. But output brightness seems more important at high current. As with XP-E/XP-E2, can I easily overdrive XT-E to increase brightness? For example up to 2A, 2.5A or more? (Of course with a good heat sink).
I didn’t manage to find plots representing relation current/lumens for the XT-E.

Yoann, with regards to the tint all I can say is the colour temperature of classic fog lights is warm white (≈3200K).

The die size of the XT-E is the same as that of the XP-E, “E” class…

If you really want a narrow beam you may want to invest on some lenses, but that'll add to the cost.

Overdriving the led? I do not think you'll end up getting a worthwhile performance boost vs the cost of the required cooling improvements (reflowing the leds onto copper DTP PCBs, etc). I'd (first) consider using a clearly higher output led (XM-L2…).

XLamp XT-E datasheet -> Page 24/38 for the relative luminous flux vs current graph.

It is a new version of the doc, I had an older one. The graph shows now 327% relative luminous flux at 1500 vs 350mA.

Cheers ^:)

Hello I have XP-L leds that use the same die than XM-L2. However to obtain similar beam I need a very big lens at a more important focal length. Then I have a more important output but it is difficult to concentrate a large part of the beam (a lot of light is lost between the lens and the led). For now I have lens of about 22mm (diameter) and a focal length of about 12mm.
If I can find lens with 25-26mm diameter and a focal length 15-18mm I think it will be great for XT-E.

I will buy XT-E leds and I will test them with my lenses.

I see in datasheet that exists XT-E S2 and S3 but they are not sold on FastTech.com.
Do you know where I can find them?