Those lights are available at Home Depot for $40 each and come with a built in dimmer switch and ready to plug in. I really like them and am using them on several tanks. The only drawback is that, especially if turned up high, they can get hot as they use 50 watt MR 16 halogen bulbs. I would recommend four inches or more clearence between the lights and the top of the tank, but I do not know any other way to get a 150 watt light fixture for $40 with a built in dimmer and ready to plug in.