If you're going to use a "legal" wattage bulb, try the Sylvania Silver Stars.
Piaa's will be suggested shortly too, I'm sure.
I'm running a 110/85 bulb in the Toomer, with power coming straight from the battery through a relay kit. Whatever you do to the light, be sure to install a relay kit and fat wires. Amazing what a full 13.5+vdc does for the light output.