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Power One HID 150W HPS DIM-ACT Electronic Dimming Ballast For HPS Lamps 150W
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Hydro Crunch 600-Watt Digital Dimmable Ballast 120/240-Volt for Grow Lights C02A011000 - The Home Depot
Sodium-vapor lamp - Wikipedia
Keystone HPS-50R-1-KIT 50W S68 High Pressure Sodium Ballast Kit - Light Bulb Surplus
