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Author Topic: What kind of lamp is this?  (Read 3458 times)

Offline Lampje

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What kind of lamp is this?
« on: July 26, 2013, 06:32:56 am »
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.

Offline Tim

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Re: What kind of lamp is this?
« Reply #1 on: August 01, 2013, 08:53:02 pm »
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!

Offline Lampje

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Re: What kind of lamp is this?
« Reply #2 on: September 01, 2013, 05:06:21 am »
Hello,

I got the answer on the lighting gallery.
It is a photometric sub-standard lamp used for calibrating optical measurement equipment. Ca.1930