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What are High Pressure Sodium Light Bulbs? from Commercial Lighting Experts.
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What is High Pressure Sodium (HPS)? - Definition from Maximum Yield
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Sodium-vapor lamp - Wikipedia
HPS - Lighting Equipment Sales
Sodium-vapor lamp - Wikipedia
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Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium
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LU70-MOGUL High Pressure Sodium Lamp - AAMSCO Lighting
