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Philips 467316 - SON 150W E26 BD54 CL SLV/12 High Pressure Sodium Light Bulb - Amazon.com
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2Pack Satco Hygrade S1932, 150W High Pressure Sodium Lamps, 16k Lumens, Type HPS | eBay
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Nichia Europe - High-power 1800K LED from NICHIA offers industry's only true alternative to High Pressure Sodium lamps
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LU250 HPS Grow Light 250w 2000K E39 Base ET18 High Pressure Sodium Lamp - Walmart.com
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PDF) LED lighting increases the ecological impact of light pollution irrespective of color temperature
OHLECTRIC 55 Watt T15 SOX55 Low-Pressure Sodium HID Light Bulb - 1800 Kelvin - Clear - BY22D Base - OL-50948 - Amazon.com
High- and Low-Pressure Sodium Lamp | SpringerLink
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Larson Electronics - 400 Watt High Pressure Sodium Light - Class 1 Division 2 Groups A-D - T3b Temperature -50,000 lumens
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