Very nice. I live in Germany. In my kittchen is a twin F40 T12 Fixture manufacted by Kaiser Idell, build in 1955. The original bulbs are F40 T12 reflector bulbs made by Osram. The Arena made in 1955 too.
depends how you use it. On average a fluory will have a life span of about 4000 hours. If your only running it in a cupboard or utility room for a few minutes that quite a few years. The downside to short term running though is you will make heavy use of the heaters, sometimes they burn out.
Most of the preheat fluorescent bulbs made in that period of time have a long life. The filaments are covered with a special termo-emission emulsion (good quality) that will make the electrons fly away and produce gas ionization.If the emulsion is gone from the filaments then the cathode sputtering makes presence AND the black area on the tube near filaments start to appear. Finally after years of use filaments loose their electron emission paste and the gas can not be ionized from proper voltage strike and maintained at a proper current from ballast. The tungsten base of the filaments is still there but is not enough to produce the electron emission.So in conclusion this is the ending for most fluorescent lamps. Of course if you push more current into the lamp you will get some more electron emission for a short period of time until filaments break or from heat you will get vacuum loss. Cheers!
It may be that the lamp was exidently dropped down. Then the owner bought the Westinghouse fluorescents in the 50s, removed the (damaged?) ends pieces of the fitting and painted it with white lacquer because the original lacquer was damaged from dropping it down.
that is a markstone light fixture, and it's made in the 40's, and they are rare, got 2 of them, one 14 watt twin T12, and one 20 watt twin T12 fixtures, they don't make black end caps one those fluorescent bulbs, i got 4 of them, and 4 of the fluorescent bulbs that has brass end caps, and the bulbs are still good, i saved them bulbs so i got a collection of them
the dark spot is a burn in the phosphor from the heaters running over many years. Sometimes it burns right through the coating and you can see the filament of the heater inside!
Very nice. I live in Germany. In my kittchen is a twin F40 T12 Fixture manufacted by Kaiser Idell, build in 1955. The original bulbs are F40 T12 reflector bulbs made by Osram. The Arena made in 1955 too.
That's incredible for a bulb to last that long !!
depends how you use it. On average a fluory will have a life span of about 4000 hours. If your only running it in a cupboard or utility room for a few minutes that quite a few years. The downside to short term running though is you will make heavy use of the heaters, sometimes they burn out.
Most of the preheat fluorescent bulbs made in that period of time have a long life. The filaments are covered with a special termo-emission emulsion (good quality) that will make the electrons fly away and produce gas ionization.If the emulsion is gone from the filaments then the cathode sputtering makes presence AND the black area on the tube near filaments start to appear. Finally after years of use filaments loose their electron emission paste and the gas can not be ionized from proper voltage strike and maintained at a proper current from ballast. The tungsten base of the filaments is still there but is not enough to produce the electron emission.So in conclusion this is the ending for most fluorescent lamps. Of course if you push more current into the lamp you will get some more electron emission for a short period of time until filaments break or from heat you will get vacuum loss.
Cheers!
It may be that the lamp was exidently dropped down.
Then the owner bought the Westinghouse fluorescents in the 50s, removed the (damaged?) ends pieces of the fitting and painted it with white lacquer because the original lacquer was damaged from dropping it down.
wow! thats pretty neat!
that is a markstone light fixture, and it's made in the 40's, and they are rare, got 2 of them, one 14 watt twin T12, and one 20 watt twin T12 fixtures, they don't make black end caps one those fluorescent bulbs, i got 4 of them, and 4 of the fluorescent bulbs that has brass end caps, and the bulbs are still good, i saved them bulbs so i got a collection of them
the dark spot is a burn in the phosphor from the heaters running over many years. Sometimes it burns right through the coating and you can see the filament of the heater inside!
I love it!
When I mail things to Quebec, I still write PQ.
I miss this technology if Im honest. LEDs are too harsh for the eyes.
Very rare