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Sylvania H39KB-175

Sylvania H39KB-175

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I got five of these lamps off of ebay a while ago. They were all dirty and the sleeves are not in the best of condition. All of them were NOS when I received them, though I have since fired one up.

46DA0587-2E6C-4252-B0E9-C14E0DE7A0D3.jpeg 04DD58D4-6055-4018-BCE2-91310EF86700.jpeg 91C7D6A0-A4BA-4B5D-A5C1-D218ACA78BDC.jpeg 8E6EFD7B-5258-413A-A3E7-E27E112765D1.jpeg

Light Information

Light Information

Manufacturer:Gte Products Corporation (Gte Sylvania)
Model Reference:H39KB-175
Lamp
Lamp Type:Clear Mercury Vapor
Filament/Radiator Type:Arc Tube
Base:Mogul E39
Shape/Finish:BT-28 Clear
Service Life:24,000+ hours
Electrical
Wattage:175
Voltage:130v
Current:1.5 amps
Optical
Lumen Output:7,800 lm
Color Temperature:5,900k
Color Rendering Index:22
Physical/Production
Fabrication Date:1985
Application/Use:Street, security and factory lighting

File information

File information

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Filename:8E6EFD7B-5258-413A-A3E7-E27E112765D1.jpeg
Album name:Mr. Orthosilicate / Mercury Vapor Lamps
Keywords:Lamps
File Size:761 KB
Date added:Aug 16, 2019
Dimensions:1848 x 2464 pixels
Displayed:84 times
Date Time:2019:08:16 20:05:55
DateTime Original:2019:08:16 20:05:55
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Focal length:4.15 mm
ISO:320
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streetlight98
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Mike McCann


GoL Mike McCann 88219189@N04/albums
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Aug 16, 2019 at 06:32 PM Author: streetlight98
Nice find! Clear MV lamps are always good finds, especially NOS! The 175W Sylvania MV lamps seem good. Their 100W MV lamps dimmed fast and it wasn't uncommon for them to flat-out fail around the rated life (which in itself is no big deal, since that's their rated life, but other brands' MV lamps last way beyond the rated life).

Please check out my newly-updated website! McCann Lighting Company is where my street light collection is displayed in detail.

joseph_125
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Aug 16, 2019 at 11:12 PM Author: joseph_125
Nice! Yeah the older BT shaped Sylvania 175w lamps were pretty good lamps. I agree about the 100w lamps dimming out early. All of my severely dimmed used MV lamps of various brands have been 100w lamps. I have a severely dimmed 100w GE that won't even start on certain ballasts.
WestinghouseCeramalux
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Aug 17, 2019 at 07:43 AM Author: WestinghouseCeramalux
Always cool to find these. Love BT lamps.

Proudy suffering from "Westinghouse Lifeguard Disease" since 1977! LOL
There's no known cure for Westinghouse Lifeguard disease, so the only way to treat it is to find more!!! LOL LOL LOL

Mr. Orthosilicate
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Aug 17, 2019 at 04:41 PM Author: Mr. Orthosilicate
I’ve heard about that problem with 100 watt lamps blackening quickly and failing. It’s because mercury lamps become less efficient at lower wattages, so the pressure inside the arc tube is made higher in lower wattage lamps to compensate for the loss in efficiency. I read in a Westinghouse mercury lamp brochure from 1950 that the 100 watt lamps operate at a pressure of 8 atmospheres. For comparison, the 250 watt lamp has a pressure of 4.5 atmospheres, the early 400 watt quartz lamps operated at 2.5 atmospheres, and the H12 (H34 in modern designation) 1000 watt lamp only operated at 1.5 atmospheres. Mind you, these figures are from 1950, so I expect they have changed somewhat.
streetlight98
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Mike McCann


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Aug 17, 2019 at 06:56 PM Author: streetlight98
Ah that's an interesting point that I had no idea about. My guess was that the arc tube is thinner so there was less surface area for blackening (so they dim at an accelerated rate compared to other wattages). A rather basic hypothesis but that was the best I could come up with.

Please check out my newly-updated website! McCann Lighting Company is where my street light collection is displayed in detail.

fluorescent lover 40
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Westinghouse OV-25s at sunset.


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Aug 17, 2019 at 10:08 PM Author: fluorescent lover 40
Nice find!

Good quality things are awesome. Cheaply made things are not.

ace100w120v
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Nov 08, 2019 at 08:34 PM Author: ace100w120v
Excellent find!
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