I agree with other's opinions about relative brightness.

Yellow has a very narrow beam.
Red or blue or turquoise seem to have the largest beams.
White is OK for standard use : bright and wide beam, no color masked...

I made a bulk order (total 51 lights : photon3, Xlights, + 1 Fusion) before Xmas, to have gifts for friends/relatives : I did get 2 D.O.A. + 1 D.O.A. CR2016 battery.
Last month I ordered 25 more (a mix of Photon 3 + Xlights) and get 5 or 6 D.O.A. lights + 4 dead batteries !!!!!!!!!!!!!!
(4 out of the 5 first Photon I tested, were dead !!!)
I hope it was just a bad batch (mainly new production (with SOS mode) white Photon3)
And sending packages back and forth between USA and France is not free ....

This being said, I'm very happy to have those tiny powerfull lights (when they work.... <img src="images/graemlins/grin.gif" alt="" />) :
in my EDC kit, I carry 1 red + 1 white Photon3 (in addition to 1 SureFire 6P - not the same purpose).
+ I put one in each FAK (car, rucksack)


Alain