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Sodium vapor_lamp

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    Pressure Sodium Vapor Lamp
    Sodium Vapor Lamp with Diffuser
    Pressure sodium vapor lamp

A Sodium vapor lamp is a gas discharge lamp which uses sodium in an excited state to produce light. There are two varieties of such lamps: low pressure and high pressure. Because sodium vapor lamps cause less light pollution than mercury-vapor lamps, many cities that have large astronomical observatories employ them.

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31-Jul-10, 7:04 pm
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