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Westinghouse Lifeguard H39KB-T175 Clear Safety Mercury Vapor Lamp This one has Westinghouse's patented crown spring cut-out to extinguish the arc if the outer jacket breaks. Keywords: Lamps

Westinghouse Lifeguard H39KB-T175 Clear Safety Mercury Vapor Lamp

This one has Westinghouse's patented crown spring cut-out to extinguish the arc if the outer jacket breaks.

WC-C250S50-DX4-72-1.jpg RP-100H38-T10-WW-1_0.jpg WL-H39KB-T175-77-1_0.jpg WL-H39-22KB-40-25_0.jpg EI-MT70-PAR36.jpg
Lamp/Fixture Information
Manufacturer:Westinghouse Electric Corporation
Model Reference:H39KB-T175
Lamp
Lamp Type:Mercury Vapor
Filament/Radiator Type:Fused Quartz
Base:E39 (Mogul)
Shape/Finish:BT28 (BT89)
Service Life:24,000 Hrs +
Burning Position:Universal
Fixture
Ballast Type:H39-22
Electrical
Wattage:175W ~
Voltage:130V ~
Current:1.52A ~
Optical
Lumen Output:7,900 (Initial) / 7,400 (Average)
Lumen Efficacy:45 (Initial) /42 (Average)
Colour Temperature:5700K CCT ~
Colour Rendering Index:22%
Physical/Production
Factory Location:Bath, NY USA
Fabrication Date:7/77
File information
Filename:WL-H39KB-T175-77-1_0.jpg
Album name:Eric / Mercury Vapor Lamps
Keywords:Lamps
Filesize:436 KiB
Date added:12 Jan 2026
Dimensions:2048 x 1220 pixels
Displayed:19 times
URL:https://trad-lighting.net/gallery/displayimage.php?pid=1089
Favourites:Add to Favourites

Comment 1 to 5 of 5
Page: 1

Max   [Mon 12 Jan 2026 at 15:55]
That design is quite neat. I have a 400 W /DX variant with that spring cutout.
Ria   [Mon 12 Jan 2026 at 16:53]
Interesting design, don't think we have any like this, will have to check Mercury Vapour Lamp
BT25   [Wed 04 Mar 2026 at 01:57]
These probably weren't made to long...maybe five years maximum.Yep, they're a neat design...Westinghouse probably had a patent.
Max   [Wed 04 Mar 2026 at 11:37]
Indeed, it's US patent number 4032816 published in June 1977.
BT25   [Sun 22 Mar 2026 at 21:25]
@Max - Figured as much.

Comment 1 to 5 of 5
Page: 1