VIVOSUN 1000 Watt Dimmable Electronic Digital Ballast - Enhanced Internal Fan Cooled Operation 25% Less Heat Generated for 15% Longer Service Life UL Listed 1000W Dimmable Ballast: Dimmable level: 600w; 750w; 1000w; super lumens (110%) Operates on 120/240V, 50/60Hz power supply. 8ft 120V power cord included. Strike both MH and HPS bulbs Overheating Protection; End-of-Bulb-Life Protection; Short Circuit Protection; Ignition Failure Protection Note: The dimmable setting of ballast should be the same watts as the bulb when starting, or your bulb may not be lighted up. The extra setting is to adjust the brightness (lumen) of the bulb. Different lumens have different effect on the plants What You Get: VIVOSUN ultra bright 1000w digital ballast, 8ft 120 volt power cord, four rubber feet, our fan-favorite 3-year warranty and friendly customer service Fully compatible for metal halide and high pressure sodium bulbs. Ensure that the bulb and ballast have the same wattage before powering on. Reduce wastage and improve usable efficiency of power supply equipment capability. Open/short circuit protection under input terminal/internal heat and radio frequency for critical components Do not operate the ballast before you read &amp; fully comprehend the product instructions. The ballast can not ignite lamp which is overheated. Re-ignite the lamp before giving the lamp sufficient time to cool down. Notice: Set ballast to the same watt option as the matched bulb before started Watt Option: 600w / 750w / 1000w / Super lumens (110%) Power Supply: 120~240V Frequency: 50/60Hz Power Factor: 99.9% Power Cord: 120V 8-feet Matched Bulb Types: HPS / MH Accessory: Rubber feet*4pcs Premium internal exhaust fan ensures the whole ballast and components stay cool. Overheating protection End-of-bulb-life protection Short-circuit protection Ignition-failure protection Stable performance with 3-year-waranty, 24/7 professional after-sales service available