Be careful not to abuse colored lighting, though. It can look really bad (especially with some of those saturated values).
For more clarification, each number tells how much red, green, and blue to have the light emit. Numbers range from 0.0 (none at all) to 1.0 (full color). Something like:
0.5 0.5 1.0 would have red and green at 50% and blue at 100%.
A better way to add more natural colored lighting is to use some of the colored light emitting textures as light sources.