You can try VHT Nightshades. I used it on my tailight and it came out pretty good. I probably used about 8 coats, way too much, but you can still see the light with no problem in the bright sun. I wouldn't put more than 3 coats on the headlight though if you actually use it, because the light output will probably suffer. You wanna take some sandpaper first and scuff up the lens really good and then wipe it with a clean cloth before spraying the tint, because it gives the paint something to stick to and it will last longer.