Only one amp....... IF it's a Marshall amp!
seriously a 600watt lamp draws about 5 amps plus a bit more including the ballast. (600watt/120volts = 5amps) regarding the fan, same rules apply when you find out the spec of the fan motor. Maybe it's 200 watts, 200w/120volts= 1.67amps. If you're using 240v as many countries use, the amperage is half of a same wattage 120volt version. Safe bet is to pad it a few amps. you may want to add more lamps, UV, fans, etc own the line I'd bet.
If you dedicate two 15 amp circuits one for each fan/lamp set, that'd be great. If not you're OK running all of it off a single 20 amp circuit, not a lot of room for expansion and other things you typically need. Make sure you use the proper size extension cords, feel them when everything has been up and running for a while to make sure it's not overheating the extension cord. Remember that other outlets could share this circuit in other rooms so keep that in mind. good luck, which I had a few 600s running nice and cool right about now.
