On your website you mention that Xterra headlight assemblies don’t have enough room for LEDs. I found other vendors offering LED protectors in Xterra headlight assemblies. Do you have any insight or knowledge that would lead you to believe these LED projectors are have some functional design flaw that makes them inoperable or otherwise of low quality?
Xterra headlights have a very narrow yet deep bowl. This makes for a tough install. The Morimoto D2S and Mini H1 projectors fit very well due to their torpedo shape- they slide right down into that deep, steep reflector bowl and get locked down, stay there. LEDs require such significant cutting of the headlight to fit that it compromises the structural integrity. LEDs are also very heavy compared to their HID counterparts, thus straining the headlight adjustment screws. I've seen several broken sets that point straight down due this failure. This is not a problem I have had with the Mini H1 or D2S projector. As an aside, I believe HID gives a much sharper, cruiser output to LED.
I do think there are two most important things to note about HID vs LED as well-
1) LED units are one piece. Meaning the LED, projector, amplified power, modulator, the whole unit is all in one assembly. If there is a single point of failure, the unit cannot be fixed. It is an expensive paperweight. With HID, each component can be replaced independently. The power amplifiers, current modulator, lenses, bulbs, which leads us to...
2) LED cannot change the output color. It is whatever you chose at the time. With HID, you can use ultra white bulbs for offroading or dark country roads, easy-on-the-eyes bluish bulbs for longer road trips, and everything in between. You can also choose to change the output power wattage with different ballasts (power amplifiers). Again, it's just the accessibility between components with HID that favors it greatly over LED in a vehicle type application.