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Author Topic: Need help with this OSRAM light bulb...  (Read 413 times)

Offline Faneco

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Offline Faneco

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Re: Need help with this OSRAM light bulb...
« Reply #1 on: October 11, 2017, 07:48:21 pm »
Anyone, please?

Offline Tim

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Re: Need help with this OSRAM light bulb...
« Reply #2 on: November 01, 2017, 09:21:47 pm »
The packaging looks modern but the design is old (drawn tungsten cage filament), so I'm a bit confused, not to mention the odd vacuum tube / valve-like 4-pin base.  Sorry, I don't have an answer on this one.  Maybe someone else will recognize it.  Interesting bulb though!

Offline Faneco

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Re: Need help with this OSRAM light bulb...
« Reply #3 on: November 02, 2017, 04:53:56 am »
The packaging looks modern but the design is old (drawn tungsten cage filament), so I'm a bit confused, not to mention the odd vacuum tube / valve-like 4-pin base.  Sorry, I don't have an answer on this one.  Maybe someone else will recognize it.  Interesting bulb though!

Hello
Thank you for your reply.
The packging is the original of this bulb, as i have a good quantity of them and all have this kind of packaging.
About the bulb itself, don't know a thing about it.
Don't you have an ideia of where it would be used?
Thank you again for your help!!
Pedro

Offline Chris W. Millinship

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Re: Need help with this OSRAM light bulb...
« Reply #4 on: November 02, 2017, 05:23:46 pm »
Those are/were, as far as I recall, navigation light lamps for ships. The use of a straight cage filament was to give it more mechanical resistance against vibration in use - many more mechanical supports inside than a regular coiled type which provide better protection. The valve type base has connections to the filament in different sections either to allow dimming by switching more or less of the filament in and out, or possibly to allow operation on different voltages depending on operation of the ship. The HM Government franking suggests military operation - they`re probably from Navy ships. Unfortunately I`m struggling with the date code so can`t say when it was produced - doesn`t seem the usual Osram format unless I`m reading it wrong.

Hope my memory hasn`t failed (as it so often does!) and that this is of use.

Offline adam2

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Re: Need help with this OSRAM light bulb...
« Reply #5 on: November 09, 2017, 08:08:43 am »
Yes, probably intended for a ships navigation light.
The old style cage filament is not only vibration resistant, but also gives a consistent light output in all horizontal directions.
The large area of the filament would also give good results in an optical system designed for an oil flame.

Some navigation light bulbs have two filaments, or a tapping part way along the filament, and therefore need more than two connections.
This lamp would however seem to be a single filament type, from the data on the packaging.

I would expect something like "80 watt + 80 watt" or "80/80watt" on a twin filament lamp.

Navigation light bulbs are often of odd voltages and are worked from a standard supply voltage by means of a dropper resistance. A small pilot lamp placed on the bridge is connected across the dropper, and by lighting confirms correct operation of the navigation light.
This bulb was probably intended for a 220 volt or 230 volt circuit, with 5 volts or 15 volts across the dropper resistance.

Offline Faneco

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Re: Need help with this OSRAM light bulb...
« Reply #6 on: November 09, 2017, 06:22:46 pm »
Hello again
Thank you so much for the help, Chris and Adam.
Any ideia on the specific name of the bulb? Or usage category?
Any ideia of their value? I have found like a big lot of them...
Thank you again.

Offline adam2

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Re: Need help with this OSRAM light bulb...
« Reply #7 on: November 10, 2017, 12:59:54 pm »
That type of lamp, rather than just the example that you have, is often known as a "cage filament navigation" lamp or bulb.

Value is rather unknown, if you have a number of them, try putting one on fleabay and see what happens ?