Just to go into a bit more detail, both All-Glass and Coralife make a 10-watt "mini compact" bulb that screws into the sockets of incandescent fixtures. Since your fixture uses two sockets, it should work out great. I have a 12" one that only has one socket, and it only lit up one side of the tank.
One or both of the manufacturers makes a 20-watt bulb as well, but you'll have to check the fixture and bulb to see if the fixure can safely take one of these. I wouldn't recommend that much light, anyway. Just stick to two 10-watts.
My only gripes are that my All-Glass compact bulb seemed to make everything in the tank look washed-out green and my crypts didn't like the sudden change in lighting. But it did make my 2.5-gallon tank look a heck of a lot brighter (or at least half of the tank).
-Naomi
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