Ukastle forums • View topic - Phasing out of lamps...
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
TrueForce LED Public (Road/Area – SOX) | 6486155 | Philips lighting
File:SOX lamps (not my image) - Coppermine - 19716.jpg - Roader's Digest: The SABRE Wiki