I put a set of 27 watt LEDs on mine. I ride home at 1am and need the light. They are cheap imports, provide a lot of light, and have held up well for over a year.
I would buy them again. The only thing to keep in mind is that the specs on those cheap lights are a bit of a stretch. For example, they are called 27 watt, and they are closer to 20. Still a LOT of light. And they are called 'spot' lights, but at 30 degrees, they are closer to flood lights.
Still a great light for the $$ though.
I put a dimmer on mine, so I run them on low during the day, off at night. But when I go to high beam they are wired to go to full power. Works great.