| Lamp/Fixture Information |
| Manufacturer: | The General Electric Company of England |
| Model Reference: | 280W SOI/H |
| Lamp |
| Lamp Type: | Low Pressure Sodium |
| Filament/Radiator Type: | Dual U-shaped arc tubes |
| Base: | UX4 (British 4-pin valve) |
| Shape/Finish: | T65, clear |
| Service Life: | 6,000 hours |
| Burning Position: | Horizontal +/- 20° |
| Electrical |
| Wattage: | 280 (2 x 140W) |
| Voltage: | 2 x 160V (2x 450V ignition) |
| Current: | 2 x 0.9A (2 x 0.81A starting current) |
| Optical |
| Lumen Output: | 19,000 lm (@ 100h) / 16,800 lm (average) |
| Lumen Efficacy: | 67.9 lm/W (@ 100h) / 60 lm/W (average) |
| Colour Temperature: | 1700K |
| Colour Rendering Index: | Ra -44 |
| Physical/Production |
| Dimensions: | 20¾ in (519 ±10 mm) |
| Factory Location: | Shaw, Oldham |
| Fabrication Date: | March 1959 (Date code QC) |
| Application/Use: | Street lighting |
| File information |
| Filename: | GEC_280W_Dual_Arc_Tube_SOI-H_Lamp_Lit.jpg |
| Album name: | Ria / Low Pressure Sodium Lamps |
| Keywords: | Lamps |
| Filesize: | 333 KiB |
| Date added: | Jul 19, 2024 |
| Dimensions: | 2330 x 1698 pixels |
| Displayed: | 23 times |
| URL: | https://trad-lighting.net/gallery/displayimage.php?pid=24 |
| Favorites: | Add to Favorites |
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Search![Osram-GEC 280W Dual Arc Tube SOI/H Lamp (lit)
Now here's a rarity..! The only known fully working example of an already rare lamp, this [url=https://trad-lighting.net/gallery/displayimage.php?pid=380][b]280W dual arc tube lamp[/b][/url] was introduced in 1959 to allow higher light output from an existing 140W lantern. Alternatively, one arc tube only could be lit for lower output after a certain pre-determined time, or to gain longer life between lamp changes.
Unfortunately, due to several factors, such as fragility and the need for two ballasts plus a change of lampholder in the fixture, it did not prove popular and was discontinued in 1969.
The images above are (left) just after ignition, (centre) after a few minutes running up, and (right) at full brightness.
Keywords: Lamps](images/image.gif?id=241042950679 "Click to view full size image
==============
Osram-GEC 280W Dual Arc Tube SOI/H Lamp (lit)
Now here's a rarity..! The only known fully working example of an already rare lamp, this [url=https://trad-lighting.net/gallery/displayimage.php?pid=380][b]280W dual arc tube lamp[/b][/url] was introduced in 1959 to allow higher light output from an existing 140W lantern. Alternatively, one arc tube only could be lit for lower output after a certain pre-determined time, or to gain longer life between lamp changes.
Unfortunately, due to several factors, such as fragility and the need for two ballasts plus a change of lampholder in the fixture, it did not prove popular and was discontinued in 1969.
The images above are (left) just after ignition, (centre) after a few minutes running up, and (right) at full brightness.
Keywords: Lamps")
