I think they're both full of shit... as far as I know... Xenon is what's used in HID lights... which require balasts... those obviously have fillimints... so they're nothing more than halogen lights... they're probably just colored LIGHT BLUE to make them seem brighter.
if you want a brighter bulb with out going HID... go PIAA... I have them in my bike right now... outstanding bulbs. had Silverstar's before that... the PIAA's were like adding another bulb in terms of brightness...
Now I'm going to HID though...
