Digital ballasts are the most cost-effective way of improving any type of hydroponic lighting system. Since digital electronic ballasts come in various wattages, they can be used by small hydroponic hobbyists, all the way up to a large commercial hydroponics operation. If your plants get a steady and constant amount of bright light without any variances in intensity, they can better use that light for conversion into the energy they need to thrive and grow. Features of the HollandBasics Digital Ballast 1000w: 1 Year In-Store Warranty Dimmable switch for adjusting power output 4 power setting - Super Lumens/1000w/600w/400w Automatically detect and operate safely at 120v-240v power input Automatically detect and operates HPS and MH lamps Operate silently for discreet operation Recommended use with 1000w Super High Pressure Sodium (HPS) or Metal Halide (MH) lamp for maximum efficiency Built-in fan system for cooling and safety Includes 120v power cord, can operate on 120v or 240v cULus listed and FCC Certified complies with American and Canadian Electrical Codes