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70 Watt Tubular High Pressure Sodium Bulb With Internal Ignitor
The Low Pressure Sodium Lamp
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Sodium-vapor lamp - Wikipedia
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The Sodium Lamp - How it works and history
250W 400W European Standard High Pressure Sodium Light - China Sodium Lamp, Sodium Bulbs | Made-in-China.com
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High Pressure Sodium Lamps – Basic Lighting for Electricians: Level 2
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High Pressure Sodium Lamps
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HIGH PRESSURE SODIUM VAPOUR LAMPS – Nordex Lighting
