The W-mart store sells an aquarium bulb that is about 6500k 10 watt that is designed to go in those hoods, should be fine for algae, i think they run about 5-6 bux. Otherwise you could put one of the coralife 50/50 screw in compact fluorescent bulbs in but those are like $20 and i think the 10 gal takes 2 bulbs, so thats more than I'd want to spend to light a fuge
The mart bulbs are in the fish section, even if your store doesnt have live fish they should have the bulb...its a straight tube instead of coiled so it fits the hood well.