Tint, Binning, and CRI Explained (For XM-L LEDs)

Thanks scaru for the effort. I understand simple.

Thanks scaru! I vote that this should be stickiedā€¦

Thank you scaru! Very well written. Nice reference and links!

Thank you

Thanks a lot for doing this Scaru, I like the way you put links to vendors of each of the tints available, I think this thread should be stickied

Thank you!

Thatā€™s what I donā€™t understand. If it is more blue and brighter the less phosphor, why are blue xml dimmer? I donā€™t think there is any way to ā€œredomeā€ an led after stripping the phosphor is there?

I doubt one could do it without losing even more light.

Just found an explanation on wikipedia.
"For example, the efficiency of a typical...yellow phosphor based white LED ranges from 3 to 5 times the efficiency of the original blue LED because of the greater luminous efficacy of yellow compared to blue light."
http://en.wikipedia.org/wiki/Light-emitting_diode#Phosphor-based_LEDs
Basically, human eyes are much more sensitive to white (or yellow) light which is the cause of all this.
http://en.wikipedia.org/wiki/Luminosity_function
The blue light produced is at 450 nm while the white light (after going through the phosphor) is around 575-600. So if you look at the graph, the human eye is very sensitive to white light, but not the blue light.
So now I understand it. :D

I do too, but its already in the one stop mod reference shop, so easy to find. :wink:

Excellent resource. Now if you could do one on the meaning of ā€œXM-Lā€ vs ā€œXP-Gā€ etc. It would be neat to know more behind the naming and designation of each.

What do you mean? The number of bond wires, size, efficiency, etc? Maybe if I get a chance I'll do that but this one was prompted by a few people PMing me in the past about tint, along with Nitro's question about where to get a neutral LED.

What surprises me is I was able to do 90% of this with out having to look anything up, I guess that's what happens when I spend so much time here.

Iā€™m beginning to worry about how much I soak up on something I take an interest in, six months ago, I didnā€™t know what an xm-l wasā€¦.know Iā€™m growing bored of themā€¦not bored as in not using them, just want to play with other things, Iā€™m going backwards though, starting playing with xp-gā€™s etc. Bothering about modes and tint more than total output.

Sometimes a q5 in a suitable host with a good 1.4a driver is more usefull than an over driven xm-l lumen monster.

Iā€™m a heretic, stone me :*

Ok, a comparison LED post is in the works.

I think Iā€™m in the same boat as you. I have drawers full of lumens and sheer output isnā€™t a real big deal to me any more. Iā€™m now more drawn to different tints and their visual relation with different beam profiles. If I see a flashlight with a choice of an XP-G 4C - 450Lm or an XM-L U2 - 800Lm, I will probably go with the XP-G 4C.

ā€¦And thanks so much Scaru. I hope you donā€™t mind that I copied and pasted your post right into my Evernote flashlight file.

Ouchyfoot, I don't mind in the least and am happy to be able to contribute back to the forum in this way. :)

I noticed you donā€™t have any links for 4C tints, which is my favorite right now, although I have yet to try a 5C.

The bad thing is, I should get a p60 host, build many pills, then its half scientific. Thatā€™s not going to happen though, I just donā€™t like p60ā€™s so common sense is out the windowā€¦

WOW! Great info Scaru!!! THANKS!!! That is the best I have ever seen the information laid out!!!

Dan.

Not quite. CW XML typical CRI is 65. Typical CRI for CW XPE, XPG, XRE, Rebel, and most other current gen 3.45mm square emitters is between 70 and 75. Typical CRI for NW and WW emitters depends a lot on the specific model of emitter. For NW, it ranges from 70 to 80 depending on the type of emitter (not including "high CRI" emitters), and for WW, it ranges from 75-85 (also not including "high CRI" emitters).