Four spade prongs and one round in the center? That sounds like the Chromega II lightsoruce and power supply. If that's true, I can tell you with certainty that the bulb is 250 watts at 24 volts. Do not attempt to feed mains current into that thing or you'll blow it for sure. I'm not sure what the fan takes, but the voltage and current requirements should be printed on the fan itself. Do not attempt to run the bulb without the fan running. It will live a short life. Ask me how I know this. The fan should start as soon as you energize the power supply and remain on until the power supply is switched off.