i have the headlights on my octavia daily tinted with lamin-x film. iv gone with the light smoke, which is a noticeable tint, and yet the headlight output isnt affected at all. im sure the darker gunsmoke tint wud have an affect though. they also do the yellow films too. my car, aswel as mates with the other varieties of the lamin-x films fitted, have gone thru MOT's with no problems

dont bother with the fly-eye tat, it just looks so cheap and nasty when u get anywhere near it! lamin-x still looks good up close, as its a proper film, not just some vinyl with holes in it

rear lights are a tad more awkward due to the various colours needed to shine thru. a lot of the VAG lads get red lamin-x and make the complete cluster red to get rid of the clear sections, but that obviously affects the indicator colour. think some people have started using green bulbs to make them flash orange still? weird, but seems to work. merely tinting them darker with lamin-x light smoke film shudnt affect colour or light output, so that shud be fine