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Facts of Light – Part 5: Everything You Need to Know About Metal Halide Lamps and Ballasts by Sanjay Joshi - Reefkeeping.com
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Sylvania 400W BT37 Metal Halide HID Light Bulb, EX39 Base, 40,000 Lumens, 3600K, Clear - 1 Pack (64705) - High Intensity Discharge Bulbs - Amazon.com
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