I did the same a while ago, used Honda CRV H1 adaptor to deal with the H1 bulb. Much brighter, yes! Improvement over OEM, undoubtedly!But, the light 'throw' is awful. Its uncontrollable, and there will be area's that are patchy. The reflectors are not designed to create a focal point for the HID. The only way to do this safely, is by fitting projectors.
I've had it checked and the light spread and pattern is spot on. H4 was slightly low so had to be adjusted but that was probablys me when I stripped the light down to clean the reflector bowls. But happy days all good. May consider fitting projectors but don't class what I've done as half a job, class projectors as optional extra..