BulbCollector Forums
BULB DISCUSSION BOARDS => Antique Bulb Discussion => Topic started by: Lampje on July 26, 2013, 06:32:56 am
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Hello,
I have a question about this lamp.
Can someone tell me when it is manufactured?
It has some marks on the inside.
5 A0
85
865
And some marks on the outside of the shape. ETL No. 1444 (Could be etched)
The construction inside looks like a sintered tungsten filament to me, but the lamp is missing the pip.
So I don't know what kind of lamp I have.
It has a tinned cap, Edison E27(E26) base.
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Sorry, I can't be of much help with this one. I agree, the way in which the filament is fastened does look similar to the construction of early sintered tungsten lamps, but the lamp is tipless - a "feature" most commonly found in later lamps. It's a puzzler for sure. Maybe someone else will recognize it. Thanks for sharing the photo nonetheless!
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Hello,
I got the answer on the lighting gallery.
It is a photometric sub-standard lamp used for calibrating optical measurement equipment. Ca.1930