Low pressure sodium SOX lamp lit showing the deep orange monochromatic light the lamps emit Stock Photo - 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
Thorn 135W SOX 2nd Generation
LED SOX Lamps | Light Efficient Design 100W LED SOX Lamp Replacement, LED-8104 | 100W, 2200K or 4000K, B22d Bayonet Base
Science, Technology and Engineering - Nightlase Technologies - Sydney, Australia