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Westinghouse Lifeguard H33GL-300/DX Econ-O-Watt Mercury Vapor Lamp From the 1970's energy crisis, where making economy lamps was the next best thing... I'd much rather find a clear version to study, but this will do! So, what's the difference between this and a standard 400W? Around a 3/4" (inch) shorter arc-tube. Looking at the right image will give some perspective, compared to a 400W... Westinghouse didn't publish what the average lumens were from this lamp...I imagine that they were dismal. Lamp data is from the Westinghouse Large Lamp Catalog, 1978 edition. Keywords: Lamps

Westinghouse Lifeguard H33GL-300/DX Econ-O-Watt Mercury Vapor Lamp

From the 1970's energy crisis, where making economy lamps was the next best thing...
I'd much rather find a clear version to study, but this will do!
So, what's the difference between this and a standard 400W? Around a 3/4" (inch) shorter arc-tube. Looking at the right image will give some perspective, compared to a 400W...
Westinghouse didn't publish what the average lumens were from this lamp...I imagine that they were dismal.
Lamp data is from the Westinghouse Large Lamp Catalog, 1978 edition.

WL-H33GL-400-N-38.jpg WL-H38-4JA-DX-N7-1.jpg WL-H33GL-300-DX-EW-96-1.jpg WL-H38-4HT-32_1.jpg GE-H400A33-1-T16-34-47-1.jpg
Lamp/Fixture Information
Manufacturer:Westinghouse Electric Corporation
Model Reference:H33GL-300/DX
Lamp
Lamp Type:Mercury Vapor
Filament/Radiator Type:Fused Quartz
Base:E39 (Mogul)
Shape/Finish:BT37/Deluxe White
Service Life:24,000 Hrs (Rated)
Fixture
Ballast Type:H33-1
Electrical
Wattage:300W ~
Voltage:91V ~
Current:3.30A ~
Optical
Lumen Output:15,700 (Initial) / Average Not Given
Lumen Efficacy:52/? LPW
Colour Temperature:4,000K ~
Colour Rendering Index:45% ~
Physical/Production
Factory Location:Bath, NY USA
Fabrication Date:9/76
File information
Filename:WL-H33GL-300-DX-EW-96-1.jpg
Album name:Cobrahead / Mercury Vapor Lamps
Keywords:Lamps
Filesize:346 KiB
Date added:Apr 06, 2025
Dimensions:2048 x 1062 pixels
Displayed:31 times
URL:https://trad-lighting.net/gallery/displayimage.php?pid=733
Favorites:Add to Favorites

Comment 1 to 8 of 8
Page: 1

Max   [Apr 08, 2025 at 04:25 PM]
That's certainly not a common one! That was clever of Westinghouse to take advantage of the fact that CWA/CWI ballasts are near constant-current systems. Try that (i.e., reduce the mercury lamp's voltage) on European choke ballast systems and you'll end up with fried inductors. As for the light output, ~16 klm is certainly not a lot but I can see a use for that in many overlit places.
BT25   [Apr 10, 2025 at 12:19 AM]
It's an odd one...I'd like to find a clear H33CD-300 someday too.
Max   [Apr 10, 2025 at 03:41 PM]
That would be interesting to see one indeed. Didn't Westinghouse make a 300 W MH variant as well?
BT25   [Apr 11, 2025 at 02:46 AM]
Yes they did...good luck finding one!
347vPowerlite   [Apr 13, 2025 at 01:14 AM]
Interesting concept. IIRC I believe reducing the lamp voltage was how the 34w T12 lamps worked to reduce the lamp power from the original 40w. They also had issues with compatibility with certain F40T12 ballast topologies.
Max   [Apr 13, 2025 at 09:27 AM]
That approach was also applied to HPS lamps as well (I have a few of those in reduced wattages, I should post one here someday).
BT25   [Apr 14, 2025 at 12:29 AM]
Yes...for example, Philips made a 360W Ceramalux (C360S51/EW) for the 400W ballast.
Max   [Apr 24, 2025 at 02:22 PM]
True, and a 225 W model was also available from that company. Less know, Sylvania (OSI) sold a British-made 350 W Lumalux lamp too.

Comment 1 to 8 of 8
Page: 1