Philips SOX 18W low pressure sodium lamp -- 12 minute warmup time lapse with spectral lines - YouTube
soxlamps.org
Chicago White Sox #1 Fan Lamp - sportsfanzshop
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
Sox LPS LED Replacement Lights & Lamps | Olympia Lighting