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I would never buy a headlight that only offeres white LEDs
Outdoor LED Lighting until they come up with white LEDs that are just as efficient as red.
Efficiency of the complete system includes the spectral response of the eye as well as the watts => lumen efficiency of the LED. The peak sensitivity of the eye is in the green to yellow-green region, not the red. See chart of sensitivity on page 281 of:
http://www.ecse.rpi.edu/~schubert/Light-Emitting-Diodes-dot-org/Sample-Chapter.pdf
White may be more efficient than red when you include the sensitivity of the eye.
Dale B. Dalrymple
