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GE Magnetic Ballast, High Intensity Discharge Magnetic Ballast, Multi-Volt 5 Ballast (1 Pack) - Incandescent Bulbs - Amazon.com
Universal Core and Coil Ballast Kit for 400W Metal Halide Lamp 120V to 480V | M400ML5AC4M500K | Bulbs.com
Advance 71A6051-001D - Metal Halide Ballast - 400W | Energy Avenue
Atco Controls OG TYPE HID MAGNETIC BALLAST 400W 100V For Mercury Vapour Lamp | eBay
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NEW Ultra Grow 400W ECO Magnetic Ballast UG-BA400 ECOS / HPS MH400W, Power Cable | eBay
Philips magnetic ballast with 400W Lec technology
M400MLTAC4M500K Magnetic Core and Coil Ballast, Metal Halide, 400W, 120-277V unlimitedlights.com