Low pressure sodium lamps (part 5)
Philips 55w SOX lamp
Philips 90w SOX lamp
Philips 135w SOX lamp
Philips 180w SOX Lamp
Philips SOX-E lamps have a Black Cap
Older Philips 18w SOX-E Lamp
Newer Philips 18w SOX-E Lamp
Philips 26w SOX-E lamp
Philips 36w SOX-E lamp
Older Philips 66w SOX-E lamp
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