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NEW! QUANTUM 400W Watt HPS & MH Dimmable Digital Grow Light Lamp Ballast | QT400. The world of indoor gardening was changed forever with the introduction of Quantum Ballast. The Quantum 400 Watt Dimmable Ballast device has gone through rigorous testing in lab facilities that replicate the most extreme atmospheric conditions, and this ballast can withstand the high heat and humidity that any garden can throw at it. It can run at either 100% or 75% power, and it strikes both metal halide and high-pressure Sodium bulbs. Plus, it runs 15% cooler than other digital ballasts on the market and has a power factor of 99.9%. nn VMInnovations is an authorized Quantum dealer that sells new, warranted products!. NEW! QUANTUM 400W Watt HPS & MH Dimmable Digital Grow Light Lamp Ballast | QT400