I grow terrestrial and aquatic plants indoors, so maybe I can help...
As long as you have no interest in having the rice set fruit, you can use lots of 6500k bulbs. Terrestrial plants need a LOT more light than aquatic, especially rice since it doesn't typically grow in the shade.
An incandescent hood might not work, since it doesn't give the rice much room to grow emersed... Maybe I'm just not understanding your setup... I plan on thinning this tank down and using it as a betta splendens biotope-
The hard part is keeping the temperature of the air close to the water (so the labyrinth organ isn't damaged when the fish breathe)
Emersed plants use lots of nutrients, so if you wanted to use some small aquatic plant for in the water (ceratopteris is also in their native habitat) with the emersed plants, you shouldn't have any problems with algae no matter how much light you use. (In the picture, it's a 5 gallon, gets a lot of sunlight, and has 23W of CFL lighting... Perhaps consider a soil substrate if you decide you have to start over? Look in my sig, I'm going to build it in a week or two.)