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Westinghouse Mazda A-H1 400W Medium Pressure MV Lamp Unfortunately I don't have a great deal of information about this wonderful piece of American lighting history from May 1942, so if anyone can help, please let me know. Keywords: Lamps

Westinghouse Mazda A-H1 400W Medium Pressure MV Lamp


Unfortunately I don't have a great deal of information about this wonderful piece of American lighting history from May 1942, so if anyone can help, please let me know.

Philips_MLU300_UV_Tanning_Lamp~2.jpg Westinghouse_Mazda_A-H1_400W_Medium_Pressure_Mercury_Lamp.jpg Westinghouse_450W_Clear_Self-Ballasted_Mercury_Lamp.jpg Siemens-Ediswan_240V_500W_MAT-V_Lamp_in_display_case.jpg Osram-GEC_80W_MB-D_Lamp_Lit.jpg
Lamp/Fixture Information
Manufacturer:Westinghouse Electric Co.
Model Reference:A-H1
Lamp
Lamp Type:Medium Pressure Mercury Vapour
Filament/Radiator Type:Aluminosilicate glass arc tube
Base:E39 (Mogul)
Shape/Finish:T-16 (T-51), clear
Service Life:4000 hours
Burning Position:Vertical, cap up
Electrical
Wattage:400
Voltage:135
Current:3.25A
Optical
Lumen Output:16,000 lm
Colour Temperature:5400K
Colour Rendering Index:Ra 6
Physical/Production
Dimensions:13 inches (330 mm)
Factory Location:Fairmont WV, USA
Fabrication Date:May 1942
File information
Filename:Westinghouse_Mazda_A-H1_400W_Medium_Pressure_Mercury_Lamp.jpg
Album name:Ria / Mercury Lamps
Keywords:Lamps
Filesize:776 KiB
Date added:11 Jul 2025
Dimensions:3072 x 1779 pixels
Displayed:10 times
Software:Shotwell 0.31.3
URL:https://trad-lighting.net/gallery/displayimage.php?pid=913
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Comment 1 to 8 of 8
Page: 1

Max   [Fri 11 Jul 2025 at 16:11]
That's a very nice one, Ria! Following the invention and commercial release of that particular lamp type by GEC of England in 1932, GE introduced its own variant in the USA in 1935. Westingouse followed suit shortly thereafter since that company had a cross-licensing agreement with GE, hence why your lamp looks so similar to that produced by GE.
Ria   [Fri 11 Jul 2025 at 17:35]
Thanks, Max. I'd really love to get the base-down version, but they weren't all that common.
Sammi   [Fri 11 Jul 2025 at 17:51]
Great to have this in our collection alongside the versions made for this side of the pond. Tubular MV Cool
Tuopeek   [Fri 11 Jul 2025 at 19:15]
My, what a big resistor, it has, all the better for starting, I guess Smile . Very new specimen you have there.
Ria   [Fri 11 Jul 2025 at 23:49]
Yes, strange to see that big wire-wound resistor..!
347vPowerlite   [Sun 24 Aug 2025 at 16:02]
Nice lamp! These are getting hard to find on US eBay as well.
wide-lite 1000   [Sun 14 Sep 2025 at 20:25]
Beautiful lamp Ria !! I was supposed to get one of these in trade with another collector . The 2 lamps he wanted arrived intact while the A-H1 Westy I was supposed to receive arrived with a hole in the top end due to poor packing . Promise after promise of a replacement lamp ended in eventual silence from said collector . He got what he wanted and I got squat !! Angry Cursing
Max   [Thu 18 Sep 2025 at 18:56]
That's a real shame given how rare those lamps are. The silver lining is that unlike quartz lamps, the burner in those medium-pressure mercury lamps can still operate reliably in ambient air. So, it's not all a waste.

Comment 1 to 8 of 8
Page: 1