Ballasts come in all shapes and sizes, but only 600w HID Ballasts will power your large 600w HPS and 600w MH bulbs. Ballasts transform the conventional electrical current coming from your wall socket into the correct current and voltage to power your bulbs. HTG Supply carries …horticultural grade old-school magnetic ballasts and new-wave digital ballasts, both designed to maximize the light energy your plant receives from your fixtures. Magnetic ballasts are tried and true technology, with decades of street-lamp driving under their belts. They’re cheap, but also heavy, noisy, and run hot. On the newer side of the equation, we have digital ballasts. With solid-state circuitry designed to push your HPS and MH bulbs to their absolute limit, digital ballasts run more efficiently, generate less heat, and have slightly higher output than magnetic ballasts. Take a peek at our offerings of 600w HID ballasts and get your grow on today!