Low Pressure Sodium - Single Ended (SO/H) Lamps
First developed by Philips in 1932, SO/H lamps were the first commercial sodium vapour lamps. Production of these lamps continued until the mid-1960s. These lamps feature a removable arc tube that is encased by an outer Dewar jacket; reducing heat losses and allowing the arc tube to reach a sufficient temperature for the sodium to vaporise.
I currently have examples of lamps made by the following manufacturers:
| OSRAM | Philips |
| GLS | MBF | MCF | MBT | Cold Cathode | Glow Discharge | SOI/H | SOX | SLI/H | Halogen | SON | MBI | CFL | Electrodeless | Hybrid | Cosmopolis | LED Retrofit |
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