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GEC Solarcolour SON-T 250W lamp Our GEC 250W SON-T lamp that we snagged on eBay. Keywords: Lamps

GEC Solarcolour SON-T 250W lamp

Our GEC 250W SON-T lamp that we snagged on eBay.

Tesla_SHCP_110W_rectified.jpg DSC03096.JPG DSC03149.JPG MA_lamp.jpg DSC02692.JPG
Lamp/Fixture Information
Manufacturer:GEC
Model Reference:Solarcolour
Lamp
Lamp Type:SON-T
Filament/Radiator Type:PCA arc tube
Base:E40
Shape/Finish:Tubular
Fixture
Ballast Type:Good old magnetic lump
Location:Personal collection
Electrical
Wattage:250W
Voltage:100V
Current:3.0A
Optical
Lumen Efficacy:2,800 lm
Colour Temperature:2100K
Colour Rendering Index:23
Physical/Production
Dimensions:256x52 mm
Factory Location:Shaw, Oldham
Fabrication Date:March 1985 (Date Code SC)
Application/Use:Street lighting
File information
Filename:DSC03149.JPG
Album name:Sammi / Sodium
Keywords:Lamps
Filesize:454 KiB
Date added:06 Nov 2025
Dimensions:2464 x 1848 pixels
Displayed:10 times
DateTime Original:2019:12:24 16:29:36
Exposure Time:1/20 sec
FNumber:f/2.8
File Source:Digital Still Camera
Flash:No Flash
Focal length:5.35 mm
ISO:400
Model:DSC-W120
White Balance:0
URL:https://trad-lighting.net/gallery/displayimage.php?pid=1031
Favourites:Add to Favourites

Comment 1 to 2 of 2
Page: 1

Tuopeek   [Fri 07 Nov 2025 at 09:34]
Like these old GEC 'snap-start' HPS lamps.
Max   [Fri 07 Nov 2025 at 18:25]
Me too. I can't believe that GEC-Osram waited until 1981 to finally use modern thermocompressive end seals for their HPS burners. I'm wondering if that's related to the Philips patents on this design (The Dutch invented it) and them becoming public domain around that time. That thermal snap switch was really a historical artefact that was used in GEC's lamps (and later German Osram's) for a surprisingly long time.

Comment 1 to 2 of 2
Page: 1