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600W Ballast Electronic Dimmable Digital 250W 400W 600W Ballasts For Garden Planter Grow Lights CMH HPS MH Bulb Input 220V-240V - AliExpress
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Amazon.com: Yescom 600W HPS MH Electronic Dimmable Ballast for Grow Light Bulb Lamp w/Cooling Fan : Patio, Lawn & Garden
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Amazon.com : TOPHORT 600 Watt Ballast Digital Dimmable Electronic Ballast for HPS MH Grow Light Bulb Lamp (600W, Purple) : Patio, Lawn & Garden
