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Sylvania 150w mirrored top spot light bulb - The Twins !

Sylvania 150w mirrored top spot light bulb - The Twins !

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These guys were an eBay purchase .

Any Ideas what they were used for ?
Any Ideas how to determine a manufacture date ? (nothing on the etch , base or stem press .
My guess is 60's or 70's !

DSCN3607.JPG DSCN3608.JPG DSCN3609.JPG DSCN3611.JPG

Light Information

Light Information

Manufacturer:Sylvania
Model Reference:150P25/2SB
Lamp
Lamp Type:Incandescent
Filament/Radiator Type:C-5
Base:Medium
Shape/Finish:P-25 ?
Fixture
Socket Type:43123
Location:my collection
Electrical
Wattage:150
Voltage:120
Physical/Production
Fabrication Date:????
Application/Use:????

File information

File information

Download: Download this File
Filename:DSCN3607.JPG
Album name:wide-lite 1000 / Incandescent lamps
Keywords:Lamps
File Size:663 KB
Date added:Dec 04, 2019
Dimensions:2464 x 1848 pixels
Displayed:38 times
Date Time:2019:12:04 17:30:00
DateTime Original:2019:12:04 17:30:00
Exposure Bias:0 EV
Exposure Time:1/30 sec
FNumber:f 3.7
Flash:No Flash
Flash Setting
Focal length:4.5 mm
ISO:250
Make:NIKON
Model:COOLPIX A300
Quality:NORMAL
Software:COOLPIX A300V1.2
White Balance:0
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-168707
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Comments
fluorescent lover 40
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Lights are awesome! :)


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Dec 04, 2019 at 05:26 PM Author: fluorescent lover 40
Maybe those concentric ring lights popular throughout the 50s-70s or an insanely big vanity mirror lol.

Power provider: Southern California Edison (SCE)

-Date decoder of some US lamps 1960-present.
-Switch and receptacle collector.
-I'll save what I can! Smiley

rjluna2
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Robert


GoL
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Dec 04, 2019 at 07:42 PM Author: rjluna2
Or it can be decorative purpose here.

Pretty, please no more Chinese failure.

wide-lite 1000
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Dec 04, 2019 at 08:26 PM Author: wide-lite 1000
These have a warning on the sleeve telling of the "positive pressure" in the lamp and how it MUST be operated in a suitably enclosed fixture and not to light it outside of the enclosure . https://www.lighting-gallery.net/gallery/displayimage.php?album=lastcom&cat=12766&pos=2&pid=168703 I wonder if these were for some kind of medical spotlight or something ?

Collector,Hoarder,Pack-rat! Clear mercury Rules!!

joseph_125
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GoL
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Dec 05, 2019 at 02:00 AM Author: joseph_125
Concentric ring lights was my guess too until I saw the warning not to operate it in a open fixture. I did some research online and it seems like medical spotlight was the correct usage. The ordering code is 150P25/2SB.
wide-lite 1000
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Dec 06, 2019 at 10:17 PM Author: wide-lite 1000
Thank you for the info !

Collector,Hoarder,Pack-rat! Clear mercury Rules!!

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