File:HPS (High Pressure Sodium) grow light bulb.jpg
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![File:HPS (High Pressure Sodium) grow light bulb.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/70/HPS_%28High_Pressure_Sodium%29_grow_light_bulb.jpg/800px-HPS_%28High_Pressure_Sodium%29_grow_light_bulb.jpg?20151216204811)
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