I remember back in the late 1990's Volvo or Saab was exploring supplimental UV driving lights that could project farther, yet didn't blind oncoming drivers because the wavelength was invisible. The idea was to be able to enhance signage and reflectors that had a flourescent quality added to them, as well as whatever naturally occuring flourescent content was out there. These UV lights were also supposed to barely scatter in fog. The problem with the fog, I think, is that objects that flouresce will reflect the UV light back at a different, visible light frequency that would then be subject to scattering by the fog.

ANYWAY, I was thinking about this after some recent night time encounters with bike-ninjas and darkly dressed, non-reflective jay-walkers. I see modern LED UV flashlights for forensic work and for finding and cleaning cat-pee. I didn't see any lumen ratings, but a couple of units mentioned a 15-20 foot range.

My question is, is there an effective supplimental UV light source that could be used on the bike for night riding, or is this a case of "if it worked, it would exist and be in use already?"