****Please note that Lumatek Ballasts come with Female Adapter installed on the lamp outlet. Male Adapter is recommended for easy installation**** Lumatek MULTI-WATTAGE 250W-400W Metal Halide Electronic Ballast. ELECTRONIC REMOTE BALLAST 5 YEAR WARRANTY(3 FULL YEARS + 2 YEARS PRORATED) • Now Multi-Wattage - power different wattage lamps on the same ballast • More lumens generated per watt of electricity consumed losing fewer watts from power supply to lamp – a power factor of 99%+. High frequency output results in low power loss. • Fast start-up reaching full brightness under one minute • Small compact design. • Produce less heat • Cut-off circuitry for ultimate safety. • Compatible with Smart Volt™ cords. UNIQUE FEATURE! All Lumatek™ ballasts come wired with our standard female lamp cord receptacle that accepts our proprietary, patented male lamp cord, making these units compatible with all Sun System®, Reef Optix® & LumenMax® reflectors. Purchase lamp cord with socket assembly separately. Specifications: * Can operate both 250W and 400W Metal Halide lamps * Dimensions: 10" x 4.3" x 3.1" * Weight: 9 lbs.