Osram Silverstars are nice, and they put out a lot of white light. The blue tinted bulbs have the blue phosphor coating which robs some of the light output so if you are going for absolute maximum lumens, go for the clear bulbs. The Silverstar H4 dual filament 55/60, which I assume is the one you want, puts out something like 1700 lumens nominal per bulb.
Me using an Osram for things it was not intended for..