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The Philips SON-E 400W high-pressure sodium lamp is a discharge lamp with opal ellipsoidal bulb and E40 base. It emits 55,600lm of very warm white light at 2000K, the golden-yellow tone typical of sodium, with colour rendering Ra 20.
The opal bulb diffuses the light and reduces glare: it is suitable for industrial high bays in buildings with high ceilings, floodlights for yards and lanterns for heavy-traffic roads designed for 400W ellipsoidal lamps.
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 400W ellipsoidal high-pressure sodium lamps with E40 base from other brands, such as OSRAM NAV-E. The average life is 36,000 hours.
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