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Sylvania H33GL-400/DX 400W Deluxe White Mercury Vapor Lamp This is a rare version of an H33GL-400/DX, being that is an ED37 from the 1980's. Usually, I don't find these as interesting as the BT37's, but this is one rare bird. Keywords: Lamps

Sylvania H33GL-400/DX 400W Deluxe White Mercury Vapor Lamp

This is a rare version of an H33GL-400/DX, being that is an ED37 from the 1980's. Usually, I don't find these as interesting as the BT37's, but this is one rare bird.

WL-H38MP-100-N-46.jpg SMV-H33GL-400-W-RS-1.jpg SMV-H33GL-400-DX-ED37-1_0.jpg SMV-H33GL-400-DX_CLEAR_BANDER.JPG SMV-H33GL-400-N-102.jpg
Lamp/Fixture Information
Manufacturer:GTE-Sylvania
Model Reference:H33GL-400/DX/ED37
Lamp
Lamp Type:Mercury Vapor
Filament/Radiator Type:Fused Quartz
Base:E39 (Mogul)
Shape/Finish:ED37/DX
Service Life:24,000 Hrs (Rated)
Fixture
Ballast Type:H33-1
Electrical
Wattage:400W ~
Voltage:130V ~
Current:3.30A ~
Optical
Lumen Output:23,000 (Initial), 18,400 (Average)
Lumen Efficacy:58/46 LPW
Colour Temperature:4,000K ~ CCT
Colour Rendering Index:45% ~
Physical/Production
Factory Location:Manchester, NH USA
Fabrication Date:9/87
Application/Use:Street/Security
File information
Filename:SMV-H33GL-400-DX-ED37-1_0.jpg
Album name:Cobrahead / Mercury Vapor Lamps
Keywords:Lamps
Filesize:427 KiB
Date added:Apr 22, 2025
Dimensions:2048 x 1527 pixels
Displayed:12 times
DateTime Original:2023:05:16 21:14:18
URL:https://trad-lighting.net/gallery/displayimage.php?pid=781
Favorites:Add to Favorites

Comment 1 to 4 of 4
Page: 1

wide-lite 1000   [Apr 22, 2025 at 08:56 PM]
I have on of these oddbulbs ! Very Happy Mine is used and from April '87 .
Max   [Apr 24, 2025 at 02:28 PM]
So, GE made BT-shaped lamps as an option while Sylvania made E-shaped lamps as an option... There really was a time period when US lamp manufacturers did not agree on bulb shape.
Cobrahead   [Apr 24, 2025 at 06:25 PM]
Its actually easier to find the GE HR400DX33/BT37 than this one from Sylvania.
347vPowerlite   [Apr 24, 2025 at 11:40 PM]
Interesting! I didn't know Sylvania experimented with the ED shape before when they started sourcing lamps from Philips and later from China.

Comment 1 to 4 of 4
Page: 1