I haven't ordered any yet, but the Hellas don't look like plastic.

 

I liked those headlight housings because of the LED inserts you can wire as daytime running and parking lights. But I don't think the reflectors would be a patch on a quality design like a Hella.

Michel - welcome, I'm middle aged (40) but definitely feel like an "old" man
There are no stupid questions, only stupid answers - so fire away.
Great to see you working on the education as well, you can overcome a lot of issues as brain plasticity is a wonderful thing and it can be nurtured and supported via various means. If you haven't read it already, the book " the brain that changes itself " is excellent.

Now to the lights, my preference would be to grab some standard design replacement headlights, either sealed beam or H4, which retain the anti-glare low beam properties and aim them as best you can to provide a safe low beam projection. Upgrade the wiring and with the new wiring and new reflectors your low beams will be as good as you can get.
For the high beams, I never try to get great performance out of standard high beam designs as the reflectors are not up to it, but again with the upgraded wiring you will have a better than original performance. For real light projection you need to run high quality aftermarket driving lights triggered off the high beams and wired with ample cabling direct from the battery. My preferred lights are the Halogen FYRLYT units, easy on the eyes with a "natural" light spectrum giving great definition of wildlife, fantastic length and breadth of beam and rugged construction.

 

I edited my original post as above.

 

I was wondering if that point was gonna come up, the US DOT has defined some explicit rules about lights & reflectors - how many there need to be, from what distance they can be seen, their size, location & luminoscity, etc. etc. etc.

A cop in the mood to give somebody a hard time could justifiably pull you over and investigate something that looks out of place...

Standard No. 108; Lamps, reflective devices, and associated equipment. - Federal Motor Carrier Safety Administration

 

Yup. I'm still trying to find out if the Hella's are ok or not.
But the Cibie's definitely are and are reportedly better lights as well. The downside is that the cost more.

Well, I actually found a phone number for Hella USA, based here in GA as it turns out. I called and found out that the Hellas actually are legal, provided you get the PN I gave (there are two other kits that aren't).

 

Truck lite had a led headlight dirt 200$ a piece. Well with it. Reviews look like it rivals modern cars headlights. I don't recall the exact size because it's in mm.
Give them a look