i need to buy 3 hoods and lights for my 70 gallon. incandescent are cheaper, but flourescent are there as well. need some suggestions on which to buy and why.
Use your main a flourescent's and if you want a little extra light with the electric bill use incandesents. This is a whole different story for a planted tank, don't use incandesents.
IMO- its not even a question - flourescent bulbs run cooler, use less power, are brighter and bring out the colors in the aquarium WAY better than incandescent..
Nothing is prettier than having a 50 watt halogen spot bulb hanging from the celing about 18 inches above a tank. This produces a wonderful "sun like" ripple effect in the water.
My next choice would be compact fluorescent bulbs.