While common, commercial lighting ballasts are designed to maximize energy savings, Digital Greenhouse ballasts are built to push lamps to their output limits and maximize your total light output. This is a premium quality high output digital electronic ballast engineered for horticultural use. Digital Greenhouse is a grower tested and approved brand for all HID, HPS, MH, and CMH/LEC lighting applications. Join the revolution, build a Digital Greenhouse today. Drives 315w CMH/LEC Bulbs, the newest innovation in HID lighting. Low-Frequency Square Wave operation and variable voltage input features combine for an efficient and versatile ballast. Lower heat output than magnetic ballasts without the humming noise.