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Amazon.com : iPower GLBULBM600 600W Grow Light Bulb Metal Halide MH Lamp for Plants High PAR Enhanced Blue and Violet Spectrums CCT 6000K : Plant Growing Light Fixtures : Patio, Lawn & Garden
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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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