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

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TSellers
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Good ideas, I’ll probably end up using all of them. Is that an actual head or optic than can be readily obtained in that picture? Maybe I can make a porch light or something.

Regards, TS

RaceR86
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Its an actual head..

Fandyfire 9 XM-L

BLF LED database – collaboration spreadsheet and latest news about where to buy LEDs
http://budgetlightforum.com/node/19342

TSellers
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Got it, comes with the emitters already I see. When I go to the site it has a pop-up telling me about the group buy for 18650, they must know I clicked through from BLF I guess. Thanks.

Regards, TS

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Thanks for the write up scaru!! Great reading material, lots of good info in a really easy way to understand!!

Samlittle
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I really appreciate your time and effort scaru putting this thread together – and to the others who have commented and kept the discussion going. Lots to read for a know nothing flashlight junkie but I’m beginning to see the light :).

I keep buying lights for all the wrong reasons then get disappointed. Finally starting to ask some good questions in advance thanks to you folks here in BLF.

Mitko
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Something important about CRI, that isnt well known and popular
Actualy CRI measures only Pastel tones, not the core RGB ones, even not the earth tones, thus its a bit….pointless.

Even more, even top priced and quality emitters doesnt perform well in representing RGB colours, especialy red(r9) and blue(r12)

Dont get me wrong, they are exellent, the technology is advansing with every single day, but for now( end of 2014) rendering the red colour is a huge issue for all led emitters, actualy i have seen only once a real R9> 80, was a Nichia 219 chip

Yes, they DO claim they have R9 over even 90, like Cree claim, but thats not true
Here, from a fresh calibrated ASENSETEK LIGHTING PASSPORT ( 2 weeks from now)

The top of the line Cree 1304 SSL Y94 CRI 95+ matrix emitter( XML is way worst than this)




Indeed, great overall CRI, hell anice chrom. chit, yet…..poor R9 performance

wight
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Subbed. I want to see what comes next on this discussion, and R9 has always seemed like an underdiscussed topic around here.

Still fine, still on a break. One day I’ll catch up with you folks! previous wight catchup Wink
list of my drivers & variants (A17DD, FET+1 stuff, WIP stuff, etc)

Mitko
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Well, for the flashlights it doesnt matter realy( r9), but the fact that CRI actualy represent nothing important isnt well known
Yet, R9 is important when we talk about interior lighting, red is the colour of your child face, the skin…the colour or the blood too- and in the real life it almost never reaches 80, regretably of course

TSellers
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One of the factors that is important to me has been recognizing body fluids (such as blood) on the snowpack at avalanche sites (can indicate the proximity of a buried victim for example), and capillary refill, cyanosis, etc., for patient assessment, particularly in winter in sub freeing temperatures.

Until now I thought that that depended on CRI, and have found that T4 emitters seem to have been best. I thought that was a result of CRI, appears I was mistaken. Is the quality of r9 better in a T4 emitter, or is that just my imagination?

Thanks for the head’s up, this is very interesting, and will change the way I view the best lights for Search and Rescue purposes.

Regards, TS

Samlittle
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Hi Scaru – here is a quote from page 1 – “Recently, (December 2012) cree released the XM-L2, which is approximately 20% more efficient than the original XM-L. This means that a XM-L2 T6 is approximately as efficient as a XM-L U3. Unless it is specified, the light does not contain a XM-L2.”

A newbie question for sure so as a newbie I ask – what does efficienct mean in this context of XM-L comparisons?

Billy X
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Hi Samlittle The efficiency is about light output(measured in lumens) per watt.this thread has a lot of info about everything to do with flashlights,but specifically,near the top,it has luminous flux tables for various emitters including XM-L and XM-L2.The XM-L U3 has 220 to 240 lumens at 700mA,the XM-L2 T6 has 318 to 341 lumens at 700mA,same thing.The XM-L2(edited) U2 has 364 to 386 lumens at 700mA.There’s your higher efficiency,more light output from the same current input.Hope this helps.

Samlittle
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Billy X wrote:
Hi Samlittle The efficiency is about light output(measured in lumens) per watt.this thread has a lot of info about everything to do with flashlights,but specifically,near the top,it has luminous flux tables for various emitters including XM-L and XM-L2.The XM-L U3 has 220 to 240 lumens at 700mA,the XM-L2 T6 has 318 to 341 lumens at 700mA,same thing.The XM-L U2 has 364 to 386 lumens at 700mA.There’s your higher efficiency,more light output from the same current input.Hope this helps.

Ah yeah – the light came on – Thanks Billy.

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