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The OSRAM NAV-T 250W high-pressure sodium lamp is a tubular discharge lamp with E40 base. It emits 33,200lm of very warm white light at 2000K, the golden-yellow tone typical of sodium, with colour rendering Ra 25 and an efficacy of 124lm/W.
It is the light source for luminaires for street lighting, car parks, yards, industrial areas and industrial buildings designed for 250W tubular sodium lamps. It is chosen where efficiency and long life matter more than colour rendering.
It works with a high-pressure sodium ballast and ignitor of the same wattage, already fitted in the luminaire; it must not be connected directly to the mains. It can only be dimmed with a dimmable electronic ballast specified by the manufacturer. It replaces 250W tubular high-pressure sodium lamps with E40 base from other brands, such as Philips SON-T. The average life is 36,000 hours.
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