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Amazon.com: YOOLUX 600W HPS Bulb (HIGH Pressure Sodium) for Indoor Plant, High PAR Promote Red and Orange Spectrums Flower Bulbs CCT 2100K, Supper Bright 90,000 Lumens. Grow Light Bulb Lamp 1-Pack :
Apollo Horticulture GLBHPS600 600 - Watt High Pressure Sodium HPS Grow Light Bulb Lamp - Walmart.com
LED vs HPS Grow Lights - Which Technology Is Best For You? - Hydrobuilder Learning Center
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