Photochromic Headlights

[WarrenRam]

I know this is probably a dumb question, but why hasn't anyone made photochromic lenses for headlights or windows yet? That's the stuff that automatically makes your glasses darken in the presence of UV. It seems obvious to me that someone should make this. When something seems obvious to me but doesn't exist, there's usually a stupid reason I didn't think of that makes me look foolish. Anyway, anyone have any input? I mean, that would make all our tinted lighting needs look like we want without losing light output at night, etc.

 

[kyleb8077]

Probably too expensive. But i'm on board with this. Id like to know too.

 

[SWJewellTN]

Considering the price to have it done to the small surfaces of glasses I'd bet it's mostly the cost in relation to the customer base wanting such a feature. There would certainly be durability issues as well when one considers the varying environment and washing.