Why A Red LED Headlamp?
Monochromatic red light has one major advantage over white light and monochromatic lights of other colors — it doesn’t affect night vision (much). The LEDs used in my headlamp produce most of their light near the 626nm wavelength. This red light doesn’t cause the pupils of the eye to constrict, and therefore night vision is maintained even when using the lamp. This is valuable on a moonlit night or when enjoying brilliant stars. It also means that the headlamp itself doesn’t need to be as bright as a corresponding white headlamp. LEDs use less power than incandescent bulbs (actually, many incandescent bulbs put out more lumens per watt than an LED, but if you want red light you have to filter all the other colors from an incandescent bulb and that makes them much less efficient). With a single lithium camera battery, this light will run for… for… for a long time. Ok, I haven’t measured it yet. If anyone wants to build one and test the run time, I’d be glad to know the results. The
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