Originally Posted by LipschitzWrath
I really doubt if they are legal. Everyone here knows that replacing your fogs OR low beams OR high beams with HID's is illegal, right? The only time it is legal to put HID's on your car is if it will only be used off-highway.
HID's make such tremendous amounts of light that they can easily turn dangerous if not aimed right. As such, the DOT decided that the only time they will approve HID's is when put into a "DOT-Approved" housing. This usually means a projector housing. Projector housing because of the excellent cutoff. Just sticking them in a reflector housing is totally illegal. Most cops won't bust you, tho.
They do make some replacement aftermarket headlights for vehicles that are DOT-approved for HID's. As a general rule, if they are not projectors than they are definitely NOT legal. But don't take that to mean that just because they are projectors, they are street legal.
Extending this on, I would guess that HID's in the reverse lights are "technically" illegal. However, I don't know for sure.
In the great state of Alberta, only DOT/SAE approved lighting is street legal. that means 90% of the aftermarket HID's would not be. I am sure it is the same south of the 49th parallel. I think 3-4000K is their colour temperature and anything higher than that, when coupled with an impropoer cutoff point for glare, is what makes most drivers swear at an oncoming vehicle with the aftermarket systems for, probably even some of our members. If I was gonna do HID conversion, I would go OEM for sure. (for headlamps) I do not think anyone will give you grief for your reverse lights, but I wonder if you would melt the lens.