I can't get pics up today, and I am going to be gone for the next few days, so just go to a hardware store like Lowes or Home Depot and ask for light sockets. Then get one that has a part to put in a light bulb on each side. Then get 2 of those screw in flourescent bulbs, look for 20 watts. They must be flourescent, not incandescent. Just ask them at the hardware store and they will know. Then when you get that stuff you will have to take apart your hood, remove the wiring from the old fixture, then wire in the new one. Its pretty simple just match up the colors of the wires.
EDIT: foil will help a little bit but it is pretty rough so it doesn;t reflect as good as a smooth flat surface. I use a piece of 1/8 inch sheet metal aluminum.
EDIT AGAIN: a reflector just helps reflect light into the tank. It won't increase the light at all.