I don't think anyone makes a headlight that's UV or Infrared. Both are not very helpful for seeing, IR is non-visible light, so it's definitely out as a method of seeing. UV light is harmful in continuous quantity, as you no-doubt know. IR lights would probably not be legal on the basis of not-providing-light, UV on the basis of being damaging. The legality probably doesn't exist because the question probably hasn't ever been raised. Some companies do make lights that appear to be, or are marketed as an "ultra-violet color", that is, they're high violet on the visible spectrum and provide a significant amount of light as well. These of course, are not true UV.