I Googled to learn XP lifetime which is the evil downside of bright. Phillips admits to running the filament hotter which greatly life. But apparently, the gas they are using doesn't hurt life much, something like 175 hours against 300.

This evening I used my headlights, red Italian car. Since I rarely drive at night I was quite mindful of the results. My 55/60W Hella originals have relay voltage boost (relay voltage boost also reduces life) and the concentrated brightness (whiter than white) blows you away, I can't imagine anything brighter. But they probably won't last a year. I have friends which went to 95W bulbs for the same brightness as my relays provided.

One thing I didn't like, in the video the light is spread all over the road rather than the specific area way out front I'm interested in. My Hella H4 are more focused but judging by a video can be misleading. I would definitely pop for the Phillips H4 XP next time around.