When gardeners upgrade to a Lumatek Digital Ballast, they"ll see the benefits instantly! From their increased efficiency to their increased lumen output, digital ballasts truly are the next big leap in indoor gardening technology. Compared to traditional magnetic ballasts, Lumatek Digital Ballasts lose less power from outlet to lamp, provide light at a far more stable level, start up faster (full light in under one minute!), and reduce the noise a system generates by running silently. These incredibly low-weight ballasts also produce less heat and a short-circuit triggers a power cutoff as a safety measure. As if all that weren"t enough, this 600W Dual Voltage unit allows growers to power with 120V or 240V with one ballast! Each unit includes a 120V power cord. A 240V Power Cord (item BPC140) is available separately. Lumateks feature a 3-year full, 2-year pro-rated warranty.