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General Electric Lucalox LU400/BD 400W High Pressure Sodium Lamp Early limited burning position HPS lamp from from October, 1970. Keywords: Lamps

General Electric Lucalox LU400/BD 400W High Pressure Sodium Lamp

Early limited burning position HPS lamp from from October, 1970.

SU-ULX150-D-68.jpg GE-LU400-BU-83.jpg GE-LU400-BD-82.jpg DSCF0291m.jpg IMG_9270.jpg
Lamp/Fixture Information
Manufacturer:General Electric Company
Model Reference:LU400/BD
Lamp
Lamp Type:High Pressure Sodium
Filament/Radiator Type:PCA (Poly Crystal Alumina)
Base:Nickle Plated E39 (Mogul)
Shape/Finish:ED18
Service Life:20,000 Hrs
Burning Position:Base Down to Horizontal
Fixture
Ballast Type:S51
Electrical
Wattage:400W ~
Voltage:100V ~
Current:4.60A ~
Optical
Lumen Output:50,000 (Initial) /45,000 (Average)
Lumen Efficacy:125/113 LPW
Colour Temperature:2100K CCT ~
Colour Rendering Index:25%
Physical/Production
Factory Location:Ravenna, OH USA
Fabrication Date:10/70
Application/Use:Roadways, Parking Lots Etc.
File information
Filename:GE-LU400-BD-82.jpg
Album name:Eric / High Pressure Sodium Lamps
Keywords:Lamps
Filesize:513 KiB
Date added:24 Apr 2026
Dimensions:2048 x 1048 pixels
Displayed:15 times
URL:https://trad-lighting.net/gallery/displayimage.php?pid=1224
Favourites:Add to Favourites

Comment 1 to 2 of 2
Page: 1

Max   [Sun 26 Apr 2026 at 05:24]
Nice classic! There are later variants from the Eastern Bloc that were made following the GE Lucalox design but with two amalgam reservoirs to enable an operation at all positions. I'm wondering why GE did not go for that as well. Maybe this complicated the accurate temperature control of the amalgam.
Eric   [Sun 26 Apr 2026 at 14:47]
Max, as to GE's methodology, I don't know anymore than you. I bought this for it's design and period of construction.
I found this one, and the LU400/BU for $25 USD plus shipping on US eBay a while back...couldn't pass them up for that price!

Comment 1 to 2 of 2
Page: 1