Jinx is right ... I have tried 3 different types of HID H4s, and am not overjoyed with any of them.
Also at this point, there are no H4s in a 50 watt fitment.
I have a couple of new H4s on the way, which I will be testing for a month or so after they arrive ... and I am more optimistic about these ones that maybe, just maybe we can get some working reliable solutions on the H4 HID front.