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The OSRAM NAV-E 400W is a high-pressure sodium discharge lamp with ellipsoidal bulb and E40 screw base, measuring Ø 122 × 285mm. With 400W it emits 56,500lm, equal to 138lm/W, with very warm white light in the typical golden-yellow tone at 2000K and colour rendering Ra 25.
It is the typical light source for street and urban lighting, car parks, yards, industrial areas and industrial buildings, where efficiency and long life matter more than colour rendering.
It only works in the luminaire, with a 400W sodium lamp ballast and ignitor: 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 400W ellipsoidal high-pressure sodium lamps with E40 base, such as Philips SON. The average life is 36,000 hours.
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