I recently installed Sylvania Xtravision bulbs. They claim they are 20% brighter. This is one of the bulbs recommended on the Daniel Stern web site.
They are a bit brighter but I didn't gain as much as I'd hoped. The pattern on low beams is more "filled in" but the high beams are still lacking. I think there is a major problem with the design of the reflector and, even if 100 watt bulbs were installed, the high beams would still be lacking. And, with high wattage, I imagine the plastic headlight assembly wouldn't last long.
I guess I'll look for aftermarket bulbs that I can mount to my bumper. The problem is choosing from the many available. I'd like an assembly that shoots a narrow beam that I can focus on the road and hopefully, won't blind oncoming drivers. Impossible to find??
Bob