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Lighting-Gallery.net - SON, SOX, MBF, MH LAMPS E.T.C/Early Philips 55w SOX Lamp 2H August 1972
Low pressure sodium SOX lamp lit showing the deep orange monochromatic light the lamps emit which causes objects to be rendered without colour Stock Photo - Alamy
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Philips SOX 18W low pressure sodium lamp -- 12 minute warmup time lapse with spectral lines - YouTube
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Science, Technology and Engineering - Nightlase Technologies - Sydney, Australia
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Philips 23404-7 (234047) MASTER SOX-E 18W BY22d 1SL Light Bulb - BulbConnection.com
