View Full Version : 600w hps

05-09-2008, 06:15 PM
does anyone know how many amps 1 600w hps light is?

05-09-2008, 07:02 PM
Watts = Volts X Amps. Watts/Volts = Amps. 600w/120v= 5 amps. 600w/240v = 2.5 amps. A ballast can add another half amp or so. Allow some finagle factor: Just three 600's on a 20A/120v breaker, just two on a 15A circuit. Remember that the pumps, fans, etc. though small wattages, still add up.