There have been a LOT of discussions on CPF about "which color is brighter", as you well know - WHITE is a combination of multiple colors and in the case of a WHITE LED is produced by a Blue or Deep-Blue LED striking a phosphor
Since the energy will be spread over a range of colors to "make white" the brightness of a White LED will be lower at any one point compared to the highest point on a normal LED and since the human eye is most sensitive at the Greenish-Blue - a Green or CYAN LED would be technically brighter than an White
But, on the other side of the coin - Humans have evolved for millions of years using the light source of the Sun - A gigantic Fusion Reactor that makes a even light combination of "White", and that is what we are used to
It converts 900 Million Tons of Hydrogen into 895 Million Tons of Helium every second
If you want to impress your friends and say "my flashlight is brighter than yours" - Get a Green or Cyan, or maybe even the Super Bright RED that we sell
Unless you go around wearing colored Glasses, your eyes are used to normal-white light from the Sun
But, when you are done trying to out do your friends - you want a flashlight that you can use for everyday functions such as reading maps, looking for keys, finding the lightswitch on the wall or your tent in the middle of the night; using a single color is going to seriously affect how your eye and brain perceive the color - You want White
I have one AA Flashlight for each color we sell (Red/Orange, Red, Green, Cyan, Amber, Blue, Deep-Blue, White ) and we do offer the complete set either as adapters or completed flashlights
As "txwest" said "Can be fun to play with" - they are, I enjoy letting the kids play with the colors, but when I need to look for something - I bring out the White
The only customers that purchase colored adapters from me for actual use and not just "play" are the astromers who like the Red/Orange to have a nice light - not to ruin their "night vision"