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Self-ballasted S450BT37 during operation The picture above shows the mercury arc tube and the tungsten ballast of a 1983 Westinghouse S450BT37 during operation. The incandescent filament was split in two M-shaped sections in order to ensure a homogeneous and symmetrical light distribution when the lamp is used in a reflective high-bay luminaire, as it often was in replacement of 500 W 120 V GLS lamps. Keywords: Lamps

Self-ballasted S450BT37 during operation


The picture above shows the mercury arc tube and the tungsten ballast of a 1983 Westinghouse S450BT37 during operation. The incandescent filament was split in two M-shaped sections in order to ensure a homogeneous and symmetrical light distribution when the lamp is used in a reflective high-bay luminaire, as it often was in replacement of 500 W 120 V GLS lamps.
GE_R400H.jpg BL400.jpg Westinghouse_S450BT37.jpg multimetal_halide.jpg SON_TS.jpg
Lamp/Fixture Information
Manufacturer:Westinghouse
Model Reference:S450BT37
Lamp
Lamp Type:Mercury high pressure self ballasted
File information
Filename:Westinghouse_S450BT37.jpg
Album name:Max / Lamps
Keywords:Lamps
Filesize:1124 KiB
Date added:16 Nov 2025
Dimensions:1003 x 1500 pixels
Displayed:58 times
Software:Adobe Photoshop 25.7 (Windows)
URL:https://trad-lighting.net/gallery/displayimage.php?pid=1055
Favourites:Add to Favourites

Comment 1 to 4 of 4
Page: 1

Tuopeek   [Sun 16 Nov 2025 at 11:37]
Great sharp crisp image there. I find it quite hard to catch images like this with the different focal points and internal reflections from the outer envelope.
Ria   [Sun 16 Nov 2025 at 17:29]
Great picture as always. Max Mercury Vapour Lamp Bulb Man
Max   [Mon 17 Nov 2025 at 04:35]
Thank you, you two!

Tuopeek - Dealing with those reflections can be a challenge indeed, so it's important to find the right angle and exposure in order to get the best outcome possible. It's a trial and error process, one that's well worth the time and effort.
AgentHalogen_87   [Mon 17 Nov 2025 at 18:24]
That's a brilliant design having two filaments. Brilliant quality image as well Cool
Was a self ballasted SON lamp ever conceived?

Comment 1 to 4 of 4
Page: 1