What are you going to do with the light? Is it important that you keep your night vision? If it is I would go with a red led. If not, hey why not the common white led? Also consider that if you are going to be reading maps with a red led then all the red colors on the map will not show, and so on, and so on with the other colored leds. I don't remember where I read this, but a website had a pics of reading a map with various colors and having certain details not show up because of the particular led color that was being used. I hope this helps.