In addition to a white spotlight, strobe, and a flood light, several of the headlamps in this review offer red, blue, and green lamps. Unlike white lights, colored lights do not affect your night vision. When I turn on a white lamp, my pupils shrink to adjust to the bright light. When I turn the white light off, it takes several minutes for my pupils to enlarge and see in ambient light. The transition time leaves me blind until my eyes adjust. With a red light, my eyes don’t need to adjust. The red light provides enough illumination to see close objects and keeps me from blinding my friends. I also find that the blue light is brighter than the red lamp and causes fluorescent fishing line to glow in the dark.