Didn't see it answered yet, so I looked it up:
H7: 55w 1350 lumens, +/- 12%
H4(low): 55w 910 lumens, +/- 10%
H4(high): 60w 1500 lumens, +/- 10%
9006: 55w 1000 lumens, +/- 15%
9005: 65w 1700 lumens, +/- 15%
Source.Those are Silverstars, btw. I'm kinda confuzed on what would be on when you have it on low beam... all 4 lights on with the H4s on low, or just the H4s on low? Oh well, something we'll just have to find out...
Since the lumen output is lower on the H4/H7, I'll have to assume the round reflector is more efficient, which is why the lamps put out less lumens.
Anyhow, Maybe if I order a set of these I can just pick my set up at the factory (if they're made in France) since I'll probly be in Germany by the time these are being produced...