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How does High Pressure Sodium lamp works?
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The Sodium Lamp - How it works and history
The Low Pressure Sodium Lamp
Sodium-vapor lamp - Wikipedia
Sylvania 67584 LU400/SBY - 400W - T14.5 - E39 Mogul Base - High Pressure Sodium - 20ct
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Sylvania 67502 LU50/MED - 50W - ED17 - E26 Medium Base - High Pressure Sodium - 20ct
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The Sodium Lamp - How it works and history
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Sodium-vapor lamp - Wikipedia
Sylvania 67543 LU1000/SBY - 1000W - ET25 - E39 Mogul Base - High Pressure Sodium - 6ct
