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
LED SOX Lamps | Light Efficient Design 100W LED SOX Lamp Replacement, LED-8104 | 100W, 2200K or 4000K, B22d Bayonet Base
File:SOX lamps (not my image) - Coppermine - 19716.jpg - Roader's Digest: The SABRE Wiki
18w low pressure sodium (SOX)lamp. - YouTube
Thorn EMI SOX/H 6W
Lighting-Gallery.net - Lanterns and Fittings/IKEA uplighter with SOX lamp
Light Efficient Design LED-8102-AMB 60 Watt LED Amber Sox Retrofit Lamp B22 Base 4000K 120-277V