pic taken from another thread:
here are the relative lumens @ 350mA
at 1A it shouldn't be too much of a difference either since they are very close.
remember the luxeon bins had about a 20lumen gap inbetween them and they were barely noticable.
T-bin 67.2 87.4
U-bin 87.4 113.6
here is a link to a review of the fenix LOD-CE Q2 and in it they compare relative brightness to their earlier review of the LOD-CE P4 and in this case the P4 version was just slightly brighter. http://220.127.116.11/translate_c?hl...3Doff%26sa%3DG
i am no expert here, but changing from a P4 to a Q2 would only make sense if you wanted a different tint.
EDIT: the review is in another language but if you scroll down you can see the numbers LOD-CE P4 being(787,742) and Q2 being (760,943)
As far as Wc and WG..are they also so close the eye can not tell the difference?
Or is 1 quite blue and the other quite purple? ( example)
What does the C and G denote..color wise?
I believe WC is blue and WG is green. The C and G just happen to be what letter what used for that tint - see above chart. I also believe they are noticeably tinted, but I don't know how subtle that tint is. If I was someone with a weak preference for tint over lumens would I drive myself slowly crazy if I had a WG bin?
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