Does anyone know what kind of " house hold type" light bulbs that would be good for lighting my 10 gallon planted tank? I have black sand and I'll be using root tabs and flourish excel but I know lighting is the most important I know the 2 to 5 watt per gallon rule but I don't know what specs I looking for my fixture will hold two regular light bulbs not the round one but the spiral ones the round ones are too wide