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Westinghouse Lifeguard H38-4HT (H38HT-100) Clear 100W Mercury Vapor Lamp With the small font etch...very hard to find nowadays. Keywords: Lamps

Westinghouse Lifeguard H38-4HT (H38HT-100) Clear 100W Mercury Vapor Lamp

With the small font etch...very hard to find nowadays.

Bayonet20adaptor20inspection20lamp.jpg 20200207_161755.jpg WL-H38-4HT-32_1.jpg Westinghouse_H33-1-GL21Y_1m.jpg Westinghouse_H33-1-GL21Y_2m.jpg
Lamp/Fixture Information
Manufacturer:Westinghouse Electric Corporation
Model Reference:H38-4HT (H38HT-100)
Lamp
Lamp Type:Mercury Vapor
Filament/Radiator Type:Fused Quartz
Base:E39 (Mogul)
Shape/Finish:BT25
Service Life:24,000 Hrs +
Burning Position:Universal
Fixture
Ballast Type:H38-4
Electrical
Wattage:100W ~
Voltage:130V ~
Current:0.87A ~
Optical
Lumen Output:4,100 (Initial) / 3,450 (Average)
Lumen Efficacy:41 (Initial) /35 (Average)
Colour Temperature:5700K CCT ~
Colour Rendering Index:22%
Physical/Production
Factory Location:Bath, NY USA
Fabrication Date:3/72
Application/Use:Residential Streets & Security
File information
Filename:WL-H38-4HT-32_1.jpg
Album name:Eric / Mercury Vapor Lamps
Keywords:Lamps
Filesize:298 KiB
Date added:31 Mar 2026
Dimensions:1428 x 977 pixels
Displayed:46 times
URL:https://trad-lighting.net/gallery/displayimage.php?pid=1167
Favourites:Add to Favourites

Comment 1 to 6 of 6
Page: 1

Max   [Wed 01 Apr 2026 at 06:22]
Nice little classic! That was certainly a good and efficient alternative to the 207-295 W 4000 lm incandescent streetlight lamps, but its harsh bright light must have come as a bad surprise to some when it was first released in the late 1930s.
Ria   [Wed 01 Apr 2026 at 14:04]
I'll have to look out our clear BT lamps now, I know we have at least one 100W one Mercury Vapour Lamp
347vPowerlite   [Thu 02 Apr 2026 at 00:39]
Very nice lamp, especially the small etch version. I settled on getting a Philips-Westinghouse version that largely looks the same as this.
Eric   [Thu 02 Apr 2026 at 14:30]
@Max - Yep, these are irresistible to collect. Very Happy
@Ria - If I remember correctly, I think I sent you one years ago. Wonder
@Joe - This version is the best to collect IMHO. Cool
Ria   [Thu 02 Apr 2026 at 19:18]
@Eric - Yes, I think you did, thanks Mercury Vapour Lamp
wide-lite 1000   [Mon 06 Apr 2026 at 01:38]
Nice ! Genius here bought a "NOS" /DX version of this . AFTER I made and offer and bought and paid for it I noticed the seller's photo that showed the coal black arc-tube ! DOH ! Embarrassed Somehow I also missed the fact that the sleeve was for a Philips/Westinghouse HPS lamp ! DOH! again !!

Comment 1 to 6 of 6
Page: 1