What is Cree Q5 & Q2?

picard said:

What is Cree Q5 & Q2?

which one is more powerful?
I am trying to select the rigt dereelight but I am confused with Q5 & Q2 acronym

http://www.dereelight.com/pills.htm

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HKJ said:

In the Cree ranking the Q5 is better than the Q2, when using the same current. But lower color temperature leds, has lower output due to the eyes sensitivity*.

*Lumens are definied according to the eyes sensitivity, a high output UV/IR light will be 0 lumens, because the eye can not see it. The eye is not good at seeing red colors, then means that any led with a high contents of red in its output will have a lower lumen rating, than blue or green output.

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HKJ said:

In the Cree ranking the Q5 is better than the Q2, when using the same current. But lower color temperature leds, has lower output due to the eyes sensitivity*.

*Lumens are definied according to the eyes sensitivity, a high output UV/IR light will be 0 lumens, because the eye can not see it. The eye is not good at seeing red colors, then means that any led with a high contents of red in its output will have a lower lumen rating, than blue or green output.

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LukeA said:

That's all taken into account when the LEDs are binned. The very cool or very warm ones are more likely to end up in lower bins, while the higher bins are more commonly neutral to greenish. This has much to do with the eye's sensitivity.

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