I purchased a number of these photon lights in October of 1997. They were quickly distributed among my family, wife and daughters. This short article is my personal review of each of the colors. I have also created a table containing my subjective evaluation of each color in some common tasks. First however, a little review of the visible spectrum as it relates to the human eye.
RED light occupies the lower, longest wavelength, segment of the visible spectrum.
The color red penetrates the furthest through any particulate matter suspended in the air like dust, smoke, and water vapor. Red thus preserves night vision . Orange light is next up from red. The eye is a tad more sensitive to this color, but it also has more effect on night vision. Yellow light is next up the spectrum from orange.