File:Lampe a vapeur de sodium.jpg - Wikimedia Commons
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Sodium-vapor lamp - Wikipedia
What is a Sodium Vapour Lamp?
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Sodium-vapor lamp - Wikipedia
Sodium (Na) Lumina Hollow Cathode Lamp | PerkinElmer
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SODIUM
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Royal Lite SOX135 135w, low pressure sodium lamp
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Sodium-vapour lamp | instrument | Britannica
Sodium-vapor lamp - Wikipedia
