it might be easier to put a filter on the lens than trying to colorise the reflector, and its changable.
i have used a very light yellow filter on the bluish leds, and had it look more like incan , but there is still huge Holes in the total spectrum that were not filled. also used gold mesh, gold filter, and yellow meshes.
green and red dont seem to reflect back on smoke, top skins of water, and fogs, but the RED and the green are very small in the Blue/white leds. so REAL incan, or red or green leds, are better for viewing through some substances, but the White led is BLUE based, your screwed from the get go.
blue seems to bounce off this stuff, and blow right back into your face.
out doors there really is not that much Blue foilage, or dirt, as george carlin would say, there isnt much "blue food".
filtering would be as usefull as the warm leds themselves. warm leds output less "lumens" but if you filtered the non-warm, it would probably be about the same, as the "warm phosphors" in the warm leds they are filtering.
you cannot selectivly filter IN a color,
the color/light had to originally exist. so in effect you would be dampening the blue, which would work great in some situations, i am just indicating that you can't color light that doesn't have those colors in it to begin with .
put a full red only filter over a blue only led, and you get NOTHING.