The entire country. http://blogs.findlaw.com/law_and_life/2012/06/are-blue-xenon-hid-headlights-legal.htmlWhere is it illegal
Hella also offer's a bixenon HID setup that is DOT legal.The entire country. http://blogs.findlaw.com/law_and_life/2012/06/are-blue-xenon-hid-headlights-legal.html
The only way to legally go to HIDs is by using original equipment that was offered as an option for you specific vehicle make, model and year. So to the letter of the law the only legal HID conversion on a Focus is putting MACHs on an SVT the same year as when the EAP package was offered. Obviously its a very lightly enforced law. Fogs aren't too big of a deal since they are usually low enough to the ground to not be a bother to oncoming traffic. Headlights are a whole different story.
To the letter, Ford would have had to sell them which I'm pretty sure they did at one point. Knowing Hella, I'm sure they are actually DOT approved unlike all the eBay shit. I did forgot about sedans the same years the MACH Audio Edition was offered.Hella also offer's a bixenon HID setup that is DOT legal.
DOT stamp doesn't mean they are actually approved by DOT. Manufactures just put it there to say they are DOT "compliant". Its pretty obvious when you look at all these eBay lights that they are nowhere hear meeting FMVSS 108.It is just a shame that most DOT approved headlamps are inferior in performance to headlamps used in Europe and Japan.
Id go a step further:IMO, the only acceptable way to instal HID or like kits is to use projectors. Putting these types of bulbs in regular housing, even foglights, is annoying and even dangerous to other drivers. Aiming regular light low (very counterproductive) still does not prevent the lights from blinding oncoming drivers.
The US has always been behind in lighting. It wasn't legal to run halogen bulbs until 1983 although I installed my first set of Cibie Biode's with halogens in 1970. I guess all my cars and were illegal for the next 13 years. After that first set I never owned anything with sealed beams in it including motorcycles. I don't know the year but it was the same way with HID. We got it last.It is just a shame that most DOT approved headlamps are inferior in performance to headlamps used in Europe and Japan.