Low pressure sodium lamps (part 6)

Later Philips 66w SOX-E lamp

Philips 91w SOX-E lamp

Philips 131w SOX-E lamp

Philips SOX-Plus lamps have a Red Cap

Philips 35w SOX-Plus lamp

Philips 55w SOX-Plus lamp

Philips 90w SOX-Plus lamp

Philips 135w SOX-Plus lamp

Philips SOX-PSG lamps have a Blue Cap

Philips 35w SOX-PSG lamp
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