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The Sodium Lamp - How it works and history
Sodium-vapor lamp - Wikipedia
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Feit Electric 70-Watt ED17 Shape Clear High Pressure Sodium E26 Medium Base HID Light Bulb (1-Bulb) LU70/MED/HDRP - The Home Depot
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Philips 70-Watt BD17 Light Bulb, High Pressure Sodium HID | 1143892 | Pep Boys
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50 Watt High Pressure Sodium Lamp S68 — LightStoreUSA
