File:SOX lamps (not my image) - Coppermine - 19716.jpg - Roader's Digest: The SABRE Wiki
Sox lamp hi-res stock photography and images - Alamy
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
Ukastle forums • View topic - Phasing out of lamps...
Osram SOX 35 low pressure sodium lamp new | eBay
Light Efficient Design 20W LED - Replaces 35W HID - 3022 Lumens - B22 Base - 4000K - UL Type B
Sox lamp hi-res stock photography and images - Alamy