Operate both metal halide (MH) and high pressure sodium (HPS) lamps. No changes are required. Up to 20% MORE LUMENS; faster growth, bigger harvests. Unique graduated fin design for more efficient cooling. No cooling fan necessary means fewer moving parts. 3 years full + 2 years no hassle warranty. Internal resin coating protects components for a long life. External breaker system protects against power surges. Generator compatible. Cuts off when a short is detected. For ultimate safety. Completely silent. Comes with "S" style lamp cord outlet plug, connects to most hoods. It has two round holes and one flat one. We source Lumateks from several suppliers so we always have them in stock. They each use their own slightly different box. They are all the same ballast however. Why Lumatek Digital Ballasts? More Lumen Output - Up to 20% more lumens output than some old style magnetic ballasts ...More light equals more yield. We urge you to test this yourself with a good quality light meter. Be sure to also check how much power the ballast is using with an ammeter as many so called 600w magnetic ballasts now draw up to 750w as standard to try to keep up with Lumatek’s lumen output. Stable Light Output - Excellent for Pharmaceutical-agriculture, laboratories and other uses where precise regularized output is essential. Fast Start-up - It reaches full brightness in under one minute; magnetic ballasts typically take about twenty minutes. Completely Silent - No noise or vibration of any kind Produce Less Heat - Less heat generated by the ballasts allows cooler running of the environment. Less heat is less wasted electricity. Longer Bulb Life - Lumen output loss over time, with the correct lamp, is dramatically less than with magnetic ballasts. Weight: 12.8 lbs. Package Dimensions: 16.4L x 8.9W x 3.8H Units/case: 4 Rated Wattage: 1000 Voltage: 240 Convertible: Yes Rated Amperage: 4.5 Warranty: 5 Year Wire Gauge (AWG): 14