Q2 LED

harro · Dec 19, 2009

Hello to anyone reading this. I wonder if you can answer a question for me. Being a nooby, i am just starting to come to terms with some of the flashlight phraseology that exists, but i was wondering why my Fenix TK20 and L2T both run Q2 LED's, but have a distinctly different tint. The L2T is a very cool white with a tinge of blue to it, whereas the TK20 has a very warm white look not dissimilar to an incandescent bulb. The TK20 is also imvho an easier light to see with, as well as being tough as old boots.

slappomatt · Dec 20, 2009

the Q2 bin number is referring to the total brightness batch that the led fits into. there are different bin numbers for color. cree has cool white, neutral white and warm white. then those are broken down into alot of smaller bins.

yellow · Dec 20, 2009

bin is brightness class,
tint is color

as it is usually not possible to order a special tint, it is lottery.
(but way better than in the early "luxeon lottery days")

csshih · Dec 20, 2009

they run "Q2" leds because cree needs to stack more phosphor on the LEDs to make them warmer, thus reducing the efficacy and getting a lower rating.

taschenlampe · Dec 20, 2009

yellow said:
bin is brightness class,
tint is color ...

That's not that accurate …

For Cree XR-E there is a Bin Code for "brightness" (Luminous or radiant
flux group => Q2 = 87,4 – 93,9 Lumen @ 350 mA) as well as for "tint"
(Chromaticity or dominant-wavelength group).

XR-E Binning and Labeling

tl

harro · Dec 21, 2009

Thanks all. I think thats helped, especially the xr-e binning link. I'm starting to realise the more you ask, the less you find you actually know! In my case, MUCH less.

Q2 LED

harro

Enlightened

slappomatt

Newly Enlightened

yellow

Flashlight Enthusiast

csshih

Flashlight Enthusiast

taschenlampe

Enlightened

harro

Enlightened

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