If it's of any help/relevance -
4Sevens Quarks are available in cool white XP-E R2 and neutral white Q3 5A
(NiteCore told me the EZaaW are mostly Q3 5B - which is the same color temperature range, but on the green side of the Planckian or Black Body Locus - BBL - 5A is on the red side) I have done side-by-side comparison beamshots of the neutral vs. cool white and to directly compare the brightness levels I removed the colors from the pics by desaturation to leave only the luminance/brightness information -
In these reviews -
Neutral White 4Sevens Quark AA Comparison Review
4Sevens Quark 123-2 Neutral, Tactical, Cool White Comparison Review
Neutral White (Warm Tinted) - Quark AA2 Neutral White Comparison Review
I'll paste the relevant beamshots here -
Neutral White 4Sevens Quark AA vs.
4Sevens Quark AA Cool White both Max NiMH
visually and in the beamshots these seem about the same brightness -
but the different tints makes the comparison difficult -
So I removed the colors by desaturation -
the levels are still "similar" with perhaps the cool white being brighter - which it should since it is an R2 as opposed to the Neutral white which is a Q3......
4Sevens Quark 123-2 Neutral vs. regular Cool White -
the cool white looks pretty blue in comparison - but it is only slightly on the blue side - see later comparisons. By eye these seem about the same brightness - but obviously the very different tints makes the comparison difficult
So I removed the color by deSaturation -
with the color removed by desaturation - the regular cool white does seem a bit brighter.
Neutral White (Warm Tinted) - Quark AA2 vs. regular cool white Quark AA2 - both Max and NiMH -
they seem about the same brightness level - but it is hard to tell with the different tints.
So I took those beamshots and removed the colors by desaturation -
it would appear that the regular cool white is just a bit brighter - but I certainly couldn't tell just eyeballing the beams even when side-by-side - so in practice it probably would not make much practical difference in the difference in brightness.
Hope that helps....