A 55 Watt low pressure sodium SOX PLUS lamp with a BC (By22d) cap. These lamps have an extremely high efficiency and emit a yellow light. They are frequently used for road lighting, crossings, airports, docks, quarries and security lighting etc. The SOX PLUS lamp has a uniform sodium distribution in the discharge tube through dimples for a more stable discharge resulting in higher efficiency and better lamp life.
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Low Pressure Sodium Lamp SOX Plus 55W BC GE/Osram/Sylvania/Philips/Venture