Don't EVER put Niteshade on a set of headlights you intend to use.
Also, if you think these are uneven at first, take a look at where the light source is in the picture.
There's something to be said about making it look factory. I'm often asked if my taillights are tinted, nobody ever really knows. To me, aesthetics are about making dozens of tiny changes that are unnoticeable on their own but add up to a complete transformation in the car's appearance and attitude. This doesn't mean adding transformers emblems or putting "ST" on every side of the car in small letters. It means making sure that each modification falls into place with the lines and styling cues that surround it. Think of your styling as greater than the sum of its parts. If a person can walk up to your car and pick up on every visual change you've made in a minute or less, your build lacks fluidity and coherence. Things are broken enough to stand out on their own.
LESS IS MORE.