I think the color is personal choice. I prefer white so I can see colors correctly. Supposedly the cyan puts out the most CP, and is still pretty good at color recoginition. I like the Arc becasue it stays pretty stable, light output wise, over the whole battery life. The Arc also uses a standard AAA battery which makes the light cheaper to run then a Photon (but more then an Infinity). It is also very simple to change the battery.