| Lamp/Fixture Information |
| Manufacturer: | General Electric Co. of USA |
| Model Reference: | S4 |
| Lamp |
| Lamp Type: | High Pressure Mercury Vapour |
| Filament/Radiator Type: | Quartz Arc Tube |
| Base: | E29s/28 (Admedium Brass) |
| Shape/Finish: | A19 (A60) / Clear hard glass (transmitting down to 280nm) |
| Service Life: | 1000 hours |
| Burning Position: | Universal |
| Fixture |
| Ballast Type: | H38 |
| Socket Type: | E29 |
| Electrical |
| Wattage: | 100 |
| Voltage: | 130 Volts (190V during starting) |
| Current: | 0.9 Amps (1.3A during starting) |
| Optical |
| Lumen Output: | 3500 lm |
| Lumen Efficacy: | 35 lm/W |
| Physical/Production |
| Dimensions: | 5⅝ inches (142.9 mm) |
| Factory Location: | Hoboken NJ, USA |
| Fabrication Date: | May 1943 (Date code 41) |
| Application/Use: | Sunlamp |
| File information |
| Filename: | GE_S4_Sunlamp.jpg |
| Album name: | Ria / Mercury Lamps |
| Keywords: | Lamps |
| Filesize: | 353 KiB |
| Date added: | 10 Nov 2026 |
| Dimensions: | 1505 x 2078 pixels |
| Displayed: | 6 times |
| URL: | https://trad-lighting.net/gallery/displayimage.php?pid=1457 |
| Favourites: | Add to Favourites |
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Search![GE S-4 Sunlight Lamp
[center]Here is a 100W GE S-4 Sunlamp from the 1940s. I already had an EOL one of these, so it was good to find a working one. This lamp has a rare E29 cap.[/center]
Keywords: Lamps](images/image.gif?id=1528936114894 "Click to view full size image
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GE S-4 Sunlight Lamp
[center]Here is a 100W GE S-4 Sunlamp from the 1940s. I already had an EOL one of these, so it was good to find a working one. This lamp has a rare E29 cap.[/center]
Keywords: Lamps")
