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Westinghouse 450W Clear SBMV Lamp Many thanks to Eric (Cobrahead) for this wonderful lamp. Unfortunately the etch is very faint so I could not get a decent picture. I was sadly unable to get a good image of the small filament inside the arc tube lighting up either, as the light from the ballast filament whited out the camera for a second. Anyone got any tips for getting a picture of that..? Keywords: Lamps

Westinghouse 450W Clear SBMV Lamp


Many thanks to Eric (Cobrahead) for this wonderful lamp. Unfortunately the etch is very faint so I could not get a decent picture. I was sadly unable to get a good image of the small filament inside the arc tube lighting up either, as the light from the ballast filament whited out the camera for a second. Anyone got any tips for getting a picture of that..?
Siemens-Ediswan_240V_500W_MAT-V_Lamp_Lit.jpg Siemens-Ediswan_240V_500W_MAT-V_Lamp_in_display_case.jpg Westinghouse_450W_Clear_Self-Ballasted_Mercury_Lamp.jpg Siemens-Ediswan_240V_500W_MAT-V_Lamp.jpg Mazda_250W_ME-D_Lamp_lit-a.jpg
Lamp/Fixture Information
Manufacturer:Westinghouse
Model Reference:S450BT37
Lamp
Lamp Type:Self-ballasted Mercury Vapour
Filament/Radiator Type:Quartz arc tube and tungsten filaments
Base:E39 (Mogul)
Shape/Finish:BT37, clear
Service Life:16,000 hours
Burning Position:Universal
Electrical
Wattage:450
Voltage:120
Physical/Production
Factory Location:Bath, NY, USA
Fabrication Date:March 1984
File information
Filename:Westinghouse_450W_Clear_Self-Ballasted_Mercury_Lamp.jpg
Album name:Ria / Mercury Lamps
Keywords:Lamps
Filesize:531 KiB
Date added:11 Jul 2025
Dimensions:3071 x 2171 pixels
Displayed:14 times
URL:https://trad-lighting.net/gallery/displayimage.php?pid=912
Favourites:Add to Favourites

Comment 1 to 7 of 7
Page: 1

Max   [Fri 11 Jul 2025 at 16:12]
I like this lamp, with its two filaments connected in series. It was certainly not designed for the lowest production cost possible. I have a (slightly) later Philips version of it, with a practically identical design.
Ria   [Fri 11 Jul 2025 at 17:36]
It's an interesting solution to the ignition of mercury lamps on such a low mains voltage.
Sammi   [Fri 11 Jul 2025 at 17:53]
I do like the BT shaped enveplops.! Mercury Vapour Lamp Cool
Max   [Sat 12 Jul 2025 at 06:29]
I was referring to the two ballasting filaments placed around the burner, which was done to ensure an even light distribution. Such design would be unthinkable today given the added manufacturing cost. You're also right that the low-voltage ignition system is an interesting one.
Ria   [Sat 12 Jul 2025 at 19:14]
Ah, I misunderstood. You're right, things today are made to a price rather than quality Confused
Max   [Tue 22 Jul 2025 at 16:32]
And inflation makes sure that goods are still more expensive day after day... I miss the quality and attention to details of older lamps produced by reputable brands in the West.
wide-lite 1000   [Sun 14 Sep 2025 at 20:40]
Nice Ria ! I got one of these from Eric aswell !
S450BT37
Lamp
Lamp Type: 450w Self Ballasted Mercury Vapor
Filament/Radiator Type: Arc-tube/ (...) clear
Service Life: 16,000 hrs.
Fixture
Ballast Type: Internal filament ballast
Location: my (...) Output: 9,100 Lumens
Lumen Efficacy: 20.2 LPW
Color Temperature: 5,500k
Color Rendering (...) Location: Bath New York
Fabrication Date: March 1984
Application/Use: general lighting

Comment 1 to 7 of 7
Page: 1