For example, you can get a PIAA 35W bulb that pulls 35W but looks like 60W.
I have a pair in h8 format. waist of money!
I really like the PIAA Cross Country HID lights - but I can't condone putting HID bulbs behind lenses not made for them. The conversion kits are as cheap as $45 instead of the $450 for the Cross Country's, and they light the road well - but they glare oncoming drivers and will get you bumped off the road by pissed off car drivers.
These are the Cross Country's.
If you want as much light as possible in the stock housing then you could change the socket from the S2 to an H4 and replace the mount. But then I'd also wire it through a relay and fuse directly to the battery. You might also want to vent it out the back a little, and switching other lights to LED to make up for the increased load would be a good idea.
The advantages to external PIAA lights would be that you can aim them separately from the bike light, including having them follow the front wheel. You can also turn them off when you don't need them and easily remove them to put on another bike if you trade up.
These PIAA 2100's are 55w halogen and look really good center mounted underthe cowling (on the triple clamp). You could mount one of these and an ON/ON switch to switch between it and your standard light.
These are the PIAA 004X 35W lamps. You can tell the 35W from the 55w because the 35W only have one mounting hole in the base.