Westinghouse S450BT37-120 Self-Ballasted Mercury Vapor Lamp

Found on US eBay nearly a decade ago...

Lit pic HERE.

Lamp/Fixture Information
Manufacturer:	Westinghouse Electric Corporation
Model Reference:	S450BT37-120
Lamp
Lamp Type:	Mercury Vapor
Filament/Radiator Type:	Fused Quartz
Base:	E39 (Mogul)
Shape/Finish:	BT37
Service Life:	16,000 Hrs ~
Burning Position:	Base Up +/- 75°
Fixture
Ballast Type:	Self-Ballasted
Electrical
Wattage:	450W ~
Voltage:	120V/60Hz ~
Current:	3.75A ~
Optical
Lumen Output:	9,100 (Initial) / 8,280 (Average)
Lumen Efficacy:	20/18 LPW
Colour Temperature:	5500K CCT ~
Colour Rendering Index:	25%
Physical/Production
Factory Location:	Bath, NY USA
Fabrication Date:	10/83
Application/Use:	RLM's
File information
Filename:	W-S450BT37-O3-120-1.jpg
Album name:	Eric / Lamps
Keywords:	Lamps
Filesize:	395 KiB
Date added:	17 Apr 2026
Dimensions:	2048 x 1083 pixels
Displayed:	12 times
URL:	https://trad-lighting.net/gallery/displayimage.php?pid=1214
Favourites:	Add to Favourites

Comment 1 to 4 of 4

Page: 1

Drew

[Fri 17 Apr 2026 at 12:39]

That is an unbelievably cool lamp! Clear self-ballasted lamps are difficult to find, never mind one of this high wattage and in a BT shape. Excellent find, looks beautiful

Eric

[Fri 17 Apr 2026 at 14:14]

Thanks! I actually found seven of these...traded or sold the others to collectors. Cool

Ria

[Fri 17 Apr 2026 at 16:06]

I think we had one from you, didn't we..? I know we have one, don't remember where we got it now..!

Eric

[Fri 17 Apr 2026 at 17:14]

@Ria - Yes, you got one of the seven. Mercury Vapour Lamp

Comment 1 to 4 of 4

Page: 1

Photo Gallery

Westinghouse S450BT37-120 Self-Ballasted Mercury Vapor Lamp

Found on US eBay nearly a decade ago... Lit pic HERE.

Found on US eBay nearly a decade ago...

Lit pic HERE.