CoralVue VHO T5 120VAC 60Hz 660 Fluorescent Ballast Unsurpassed Versatility - A Model 660 can operate up to 16 lamp feet with a total of 464 rated lamp Individual lamps can be 2 through 6 feet each. This corresponds to 12 different lamp configurations Maximum light output with VHO and HO lamps Cold temperature starts to -40 degrees Celsius Does not include power cord