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Hydrofarm PH57360 Powerhouse 600W 120/240v HPS Ballast. The Powerhouse is packed with features which make it the most advanced electromagnetic HID ballast on the market. With its durable all-aluminum exterior construction and offset high/low component orientation, it runs quieter and cooler than any other ballast we have ever made. Cool components mean higher performance and longer life. Hydrofarm PH57360 Powerhouse 600W 120/240v HPS Ballast