Personally, I don't understand the urge to play with aftermarket lighting parts, especially when major aftermarket suppliers such as Depo can't even design replacement headlamps that physically fit on such exotic vehicles as the Ford Taurus.
That's without getting into the photometrics, which are similarly laughably bad. And these are "certified" aftermarket parts from major suppliers.
My life is already sufficiently endangered by clueless drivers sharing the road with me. I personally don't feel any such urge to gamble with higher insurance rates and possible bodily harm to play with "Morimoto" and Spyder parts.
Also, I have a certain reverence for federal law, so I refuse to support "Morimoto," which uses a variety of tactics to circumvent federal law and detection by customs officials.
I could lecture for days about the stuff "Morimoto" pulls, but let's start with a laboratory analysis of some $1500 "Morimoto" headlamps for the Ford F-150. It revealed that they are using "Chi Mei Wonderlite" polycarbonate for the lens material. That is some bottom-of-the barrel crap, rated to last only 3 years of sun exposure maximum with a 30% haze tolerance if a proper UV hardcoat is applied. This is stuff used for chocolate boxes and high-heel shoes. In other words, if you spend $1500 to rip out the OEM Ford headlamps, you get headlamps that can only last 3 years in the sun without hazing significantly (up to 30% haze!)
There are plastics rated to last 5+ years and cost slightly more, but nope, "Morimoto" feels the need to milk people for every last cent when the headlamp itself probably cost like $100 to make. Most OEMs now are speccing 5+ year plastics now anyway; that's why you don't see 2014 F-150s with hazy headlamps (yet).