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eGrow 400 Watt Digital Grow Light Ballast for HPS MH Bulbs, Indoor Grow Lamps, Horticulture
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Electrical ballast - Wikipedia
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IceCap 250w Selectable Wattage Electronic Ballast | CoralVue
TOPHORT 600 Watt Ballast Digital Dimmable Electronic Ballast for HPS MH Grow Light Bulb Lamp (600W, Purple)
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Spectromaster Dimerabile Digital Ballast 600W Spectromaster 600w Digital Ballast | Lighting \ Ballasts HPS & MH \ Electronic ballasts | Maxgrowshop.com
