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History of low-pressure sodium lighting
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Lighting-Gallery.net - Lighting out & about./SOX nightshot
Old street lamps against grey sky with overhead power lines wires, first lamp post is a decades old concrete type with SOX lamp, Glasgow Scotland UK Stock Photo - Alamy
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A comparison between 1960 and today's lighting! – MMA Lighting Consultancy
Bright idea: transforming Ghana with street lights | Working in development | The Guardian
soxlamps.org
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street lighting | uk > installations > 35w sox reburbishment scheme