Bought item and used for less than a month, brand new it retails for $270 online, probably more in retail stores. Basically, your saving over a hundo for just several weeks of use it had prior to buying when buying this unit. 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. Slim design maximizes space in or out of the grow room. High-Frequency operation and variable voltage input features combine for an efficient and versatile ballast. Lower heat output than magnetic ballasts without the humming noise. 5-Year warranty, 3-year complete, 2-year pro-rated SKU: BAL-DG-S1000