My headlights and turn signals are basically the exact same style as those TYC's. They just look dark because the black reflects of the back of the light and so it looks tinted when they aren't.
I didn't have my corners tinted, I bought them like this. This looks to be the exact same lights I bought.
http://tlnautoparts.com/index.php/06-00-24-19116.html
Which kind of makes me mad, because I paid $40 for mine, but whatever.
I'm pretty sure they're DOT approved, but even if they aren't, I doubt you'll ever have any issues. The requirement is that there is an amber reflective surface on the corner, so I don't know why they wouldn't be compliant. I had clear corners on before, and never had a problem, and those don't have any amber on them, just the amber bulb in the bottm light.