Electronic systems come with reflector, ballast, bulb of choice, and cord and socket. For details on reflector or ballast options see related items. Electronic Sun System Galaxy and Lumatek ballasts are wired for 120/240V operation. The 250 watt, 400 watt and 1000 watt are MH/HPS switchable. Comes prewired for a standard wall plug, 120V operation. The ballast does offer Multi-Volt operation, simply flip the 120/240 switch and plug in a Smart Volt 240V power cord, available for $12.99 (903082). Bulbs are warranted for one year, ballasts for five. More lumens generated per watt of electricity consumed - LumatekTM ballasts have increased efficiency over magnetic ballasts. They lose fewer watts from the power supply to the lamp. This is a power factor of 99%+. The high frequency output results in low power loss Fast start-up - they reach full brightness quickly Completely silent Small compact design Produce less heat Cut-off circuitry - cuts off when a short is detected for ultimate safety Lamp cord receptacle compatible with all Sun System® reflectors and sockets Operates both HPS & MH bulb Completely silent and lightweight Extremely efficient - 99% power factor FCC compliant Generator ready Note: It has been our experience that in some cases, the Hortilux bulb does not fire in Galaxy ballasts, please contact Hortilux for more information. Also, may cause interference with Constant pH or ppm meters or other electronics in close proximity; call manufacturer for full disclosure.