600 watt Air Cooled Cylinder HPS Dimmable Electronic Digital Grow Light System Operates both HPS & MH CONVERSION lamps Lamp cord receptacle compatible with all Sun System reflectors and sockets Cuts off when a short is detected for ultimate safety Comes with FREE Light Mover Features the Air Cooled Cylinder Reflector (23.5 long x 6 diameter)  All ViaVolt light kit ballast are UL and FCC compliant.