Auto Industry - Plastic Headlights Leave You Blind in the Fog
Years ago the auto industry went to sealed beam headlights because they are superior to headlights where you replace the bulb and are left with the old reflector and lense. Plastic headlights are even worse because they easily become scratched. The scratches and dust that accumulate in these headlights diffuses the light into the line of sight of the driver. In clear conditions this is hardly noticeable except you may not have the clear definition of the highway, but in heavy snow or fog it illuminates the snow or fog in front of the driver and can completely blind him or her to the road ahead. It's like having dirty headlights all the time. To make matters worse many manufactures angle this lens upward to compliment the sleek body style, might look cool but not advantageous to clear vision in my book. I have an old 72 Chevy Pick up that looks a little beat up but its sealed beam headlights outperform most vehicles today that are only a few years old.
Next time your driving through some fog pay attention to the halo of the cars approaching you. Good headlights you will see 2 definite beams focused down at the highway, a large halo means the drivers vision is being obstructed. If he has sealed beams all he should need to do is clean off the headlights, if he has plastic headlights cleaning may not do it. Do everybody a favor and get off the highway.
As far as the manufacturer's go I have to question the quality of the engineering that would put anything but a sealed beam headlight in a vehicle. I wonder how many people have died and will die either because they were blinded by their own headlights or the car they were meeting was blinded by own headlights.
A vehicle with sealed beam headlights will illuminate the highway as clearly when it's 40 years old as it did when it was driven of the showroom floor.
Apparently human life is not as important as it was 40 years ago.