SOX Sodium, LPS or low pressure sodium lamp warming up. The lamp gradually turns from red to orange as the neon discharge warms the sodium metal up Stock Photo - Alamy
SIDE ENTRY1981 MK15 THORN BETA 5 STREET LIGHT LANTERN 35W SOX INTERNAL GEAR | eBay
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File:SOX lamps (not my image) - Coppermine - 19716.jpg - Roader's Digest: The SABRE Wiki
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Phosco P226 35 watt Low Pressure Sodium (SOX / LPS) Streetlight + Dusk Switch-On - YouTube
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soxlamps.org
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Ukastle forums • View topic - Yorkshire
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UK firm finds niche in easy street lamp refits
Lighting-Gallery.net - Light installations /55w sox street lights left at Cambridge regional collage
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SOX Street Light at best price in Mehsana by Topsun Energy Ltd. | ID: 6939030173
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SOX lighting still sees use in 2018 — Steemit
M4 MOTORWAY
History of low-pressure sodium lighting
