Review on Fulham Lighting SC120-113 Energy-Saving CFL Ballast by Girish Underwood

If you have a 24" aquarium hood with a standard 18" 15W bulb, it will replace the original ballast. screws right in. Just cut the wires and connect them with nuts with wires of the same color. In fact, it's better than the factory because the originals come in a stamped metal can. This mod is housed in a sealed plastic case. Ignore the 13W power rating as the original was rated for the same power. Watts/Volts = Amps. Only 0.017 ampere difference from 13 to 15 watts.