Having tested all of the colors of the Photon lights, I believe I have found an interesting phenomenon.
Despite the brighter beam of the white and blue and turquoise, they provide less resolution (clarity of vision). This is true at 6 feet and 20+ feet.
My daughter and I were comparing the various colors at six feet from the LCD display of the thermostat; the LCD script being about 1/4" in height. The blue, white and turquoise would light up the thermostat, but the letters were impossible to read; with the white, you could not even see that there were letters. Picking out the outline of a lamp about 20 feet away was much the same; the outline was very difficult to distinguish with the above colors.
When the yellow, orange, and especially red were used, the letters on the thermostat practically jumped out at you. The exact outline of the lamp was easy to perceive.
The red was the best, yielding an illumination, which, while slightly dimmer, revealed objects in sharp detail.
After consideration, I believe this to be a phenomenon of chromatic aberration. The lens and cornea of the eye refract (bend) different wavelengths (colors) of light to different extents. Blue light is over refracted, and focuses in front of the retina, yielding a blurred image.
One would think that the white would be best, as it is a full spectrum light, with a color temp. of 6500K, but the energy is displaced towards the higher energy (blue) end of the spectrum; this is seen as a lavender tint to the white light.
I would be interested in the observations of other posters. Any comments, additions, corrections, or criticisms are welcome. Walt
PS; these lights are TERRIFIC; get some for stocking stuffers. Carry one with you always. One common theme in the injuries I saw in the Emergency Dept over 20 years was lack of light causing people to injure their extremeties. Be safe. I have no relationship, other than being a satisfied customer, with any of the distributors of these fine lights. Walt