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Antique Bulb Discussion / Re: Architectural Historical Question
« Last post by adam2 on February 13, 2018, 06:06:13 pm »
A 60 watt carbon filament lamp would give a ROUGHLY similar light output to a modern 25 watt incandescent lamp, the colour would still be wrong though. The modern lamp would be whiter.

An early type of 60 watt metal filament lamp would be broadly similar in output to a modern 40 watt incandescent lamp. The modern lamp would be somewhat whiter, but the difference would be small.

If an approximation of the original lamp type is acceptable, then I would select one of the many modern reproduction vintage lamps that have a squirrel cage metal filament. Expect to pay as little as £2 each

For a closer approximation, select a modern carbon filament lamp of about 60 watts loading, I THINK that Phillips still make these, they certainly did make them until recently and supplies are still available. They are very expensive, I saw one recently on fleabay for over £30.
Antique Bulb Discussion / Re: Interesting old lamp to identify
« Last post by Mónico González on February 12, 2018, 09:27:19 am »
Could you upload a picture of that lamp to it coud be viewed?. By your description and explanation it seems to be a projection Stereopticon carbon lamp. These ones were used as light source for precission optical devices.
Antique Bulb Discussion / Interesting old lamp to identify
« Last post by LouBet on February 11, 2018, 05:51:56 pm »
The most noteworthy item to note on this lamp is the filament which looks like a miniature bed spring.   This spring is mounted sideways and is about 5/8 inch long tapering from one end to the next.   The bulb portion is almost exactly 3 inch in diameter and the entire bulb is right at 5 inches long.   The base is a tarnished brass and then there is a tarnished brass collar or ~ 5/8 inch wide ring found just above that at the very base of the glass taper.   The filament is good even though the bottom center connection has an ashen solder that fails to provide good contact.   Any ideas are welcomed
Thanks guys
Antique Bulb Discussion / Re: Architectural Historical Question
« Last post by bungalowboy on February 11, 2018, 10:59:57 am »
Thank you for the informative reply, it is all very interesting.

I have some follow-up questions:
So would a 60 watt light bulb of 1911 give about 50% of the light of a modern 60 watt bulb or even less? Half of a 40 watt? What would be your educated guess of an approximation?
Just wondering if I have them on a dimmer what the light emitted would cast to illuminate the room back in 1911.
Antique Bulb Discussion / Re: Architectural Historical Question
« Last post by adam2 on February 09, 2018, 07:03:06 am »
The lamps used then would almost certainly have been carbon filament types, 16 candle power was a very common type. They used about 60 watts and gave a very dull yellow/orange light by todays standards.
A modern 60 watt lamp would be much too bright and also much whiter, and nothing like the original.

Carbon filament lamps are still available but are very hard to find. A fleabay search is of very little help since most of the results will be for modern reproductions of early tungsten lamps and not carbon filament.

Most early lamps were available frosted at an extra charge, they were however EXTERNALY frosted and this external frosting tended to attract dirt, dust, grease and finger marks. INTERNAL frosting as is still used today was a later invention.
External frosting was achieved by dipping the bulb in hydrofluoric acid, internal frosting was by filling the bulb with the acid and then emptying and rinsing it before the rest of the manufacturing process.
Inferior external frosting was by coating the bulb with various materials, the heat of operation tended to destroy or remove the coating.

I doubt that you will find a modern carbon filament bulb that is frosted. Carbon filament bulbs are expensive, and hardly anyone wants to pay all that money for a carbon filament and then to hide it behind frosting.

By 1911 it is just possible that very early metal filament bulbs were used, in that case the modern but vintage style filament lamps sold everywhere would be a passable imitation. Frosted ones are rare, reason as above.

Antique Bulb Discussion / Architectural Historical Question
« Last post by bungalowboy on February 04, 2018, 02:21:42 pm »
Hello all,
Thank you for this forum of gathering information on bulbs. I know very little about bulbs but have recently been researching and discovered this site.
I bought an old house and have discovered that it was designed by a prominent local architect which makes it quite historical. I have also discovered architectural drawings of my home in a collection at the local University which features details of the lighting in the dining room/living room. This drawing was made in the summer of 1911. Upon further research I find that Marvin Pipkin invented the frosted bulb in 1925.
My questions are what would 16 candle power equate to with a modern bulb and how were they frosted back in 1911? I am trying to accurately reproduce this in my home so all the information that you can provide is welcome.

Butch in SLC
Please let me know if you are interested in selling these items ?
Antique Bulb Discussion / Re: Need help identifying bulb and finding replacement
« Last post by Kywildcat on January 14, 2018, 09:00:19 pm »
Thanks for the reply. I thought the bulb bases looked pretty standard, but supposedly the color was what was unique about the bulbs.
Were pinkish/red colored bulbs all that unique or valuable from 70ish years ago?
From that I get the impression that the bulbs weren't all that valuable, more just the sentimental value of having them that long.
I'm thinking the lamps would look good with some of the LED Edison bulbs, for the antique look. Thanks again!
Antique Bulb Discussion / Re: Repairing old bulbs
« Last post by adam2 on January 14, 2018, 09:58:34 am »
As the previous posts show, repair is certainly possible but it is a non trivial task that needs a well equipped workshop and a fair bit of equipment.
You also need reasonable experience in glass working, this can be gained by practice on cheap modern stuff before risking anything old or valuable.

The most expensive item needed is a high vacuum pump.
Antique Bulb Discussion / Re: Need help identifying bulb and finding replacement
« Last post by adam2 on January 10, 2018, 08:05:42 pm »
It looks to me like a fairly standard screw base bulb in a light pink or peach colour.
I doubt that you will be able to get an exact match, but something similar should be readily available.
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