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
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 Lamps (SOX-E91W) - China Sox Lamps and Lps Lamps
Low Pressure Sodium HID SOX Lamps – LIBERTY LIGHTING 408-748-9970