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VIVOSUN: The #1 Choice for Indoor Grow The most reliable ballast on the market - 1 million+ happy users and counting. Operates on a 120/240 V, 50/60 Hz power supply. Has a continuous power factor of 99.9%. Exclusive Technology "Soft Start"-allows multiple ballasts to start at the same time. "Slow Light Start-up"- a healthy way to starup the bulb and reduces risks of premature failure of bulbs. World Famous Warranty At VIVOSUN, we believe in our products. That's why we back them all with a 3-year warranty and provide friendly, easy-to-reach support. For Optimal Use: Don't operate the ballast before you read and fully comprehend the instructions. The ballast can't ignite lamps when it is hot. When reigniting the lamp after shutting down, please wait 3 minutes to give time for the lamp to cool down.