My parents went on vacation to the New England area...and went to a museum and saw this lightbulb and thought of me and took a pic to send to me! Now I am sharing this all to you! Enjoy!
@Form 109 yes it is 5800F but it is the filament itself, not the outer glass.
@gailgrove a 100w 750-1000 hour bulb emits about 1600-1750 lumens. Remember the efficency increases with wattage. I seem to remember this bulb getting 20-25 lumens per watt so that could be up to 1,250,000 lumens!
@silverliner14B so that means the Outer Glass should be at least 500 F Right?
this has to have a Special Fixture i bet....its such a Fire Hazzard if it were to be used improperly....and since it requires such high amperage no way you could run this thing at a typical house with 200 Amp Service.
They would have been used in mobile Airport Floodlights see HERE it gave 1/2 Billion Candlepower from a 50kw lamp, also if the lamp gets 500 deg C it would need to be Forced Cooled to reduce the Glass softening and exploding as can happen with old Filament Projector Lamps, Re the Cabling it would need to be about 40 to 60 mm2 as found in Heavy Industry.
Form109, there is NO such a thing as a 0 AWG, a bigger AWG than 1 is "Aught" which starts with 1/0, 2/0, 3/0, 4,0 and after that its 250, 350, 400 and go up to 1000....
If this needed 420 amps then the wire size would be 350 if using a 75 degrees wire rated type THHN copper.
Yes Dave that's right! I see you have learned stuff in school! Good job...do you have the NEC 2008?
But when say the wire numbers...if you said "I want # 4 wire" that means you refer to 4 AWG....but if you say "I want 4 "aught" wire" that means you are refering to 4/0!
I have read that, In 1954, the largest light bulb, rated at 75000 watts, was lit at the Rockefeller Center in New York, to commemorate the 75th anniversary of Edison’s first light bulb. The huge bulb was 3-1/2 ft high and about 2 ft in diameter. From high above, it illuminated the entire skating rink. It was allowed to cool for five minutes after burning for three minutes. In Jan 1879, at his laboratory in Menlo Park, NJ, Edison had built his first high resistance, incandescent electric light, though its thin platinum filament in a glass vacuum bulb burned for only a few short hours. He then tested thousands of substances before coming up with a more useful carbon filament which he presented in a public demonstration of his light bulb on 31 Dec 1879.
Also higher voltage lamps are less efficient than than lower voltage lamps for the same lifetime (thicker filament -> more tungsten to evaporate before it breaks -> can operate at higher temperature for the same lifespan, so more efficient).
I seen a couple of these at the Smithsonian museum ten years ago. I think one was 50kW and the other 75kW and were for some sort of Edison commemoration. Other notable exhibits were fluorescents with partial phosphors to see the internals while lit, and all kinds of electrical gadgets dating back to the 1800's. Come to think of it Jace, you don't live too far from there....you should check it out!
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@gailgrove a 100w 750-1000 hour bulb emits about 1600-1750 lumens. Remember the efficency increases with wattage. I seem to remember this bulb getting 20-25 lumens per watt so that could be up to 1,250,000 lumens!
this has to have a Special Fixture i bet....its such a Fire Hazzard if it were to be used improperly....and since it requires such high amperage no way you could run this thing at a typical house with 200 Amp Service.
All the Best
Colin
If this needed 420 amps then the wire size would be 350 if using a 75 degrees wire rated type THHN copper.
But when say the wire numbers...if you said "I want # 4 wire" that means you refer to 4 AWG....but if you say "I want 4 "aught" wire" that means you are refering to 4/0!
I have read that, In 1954, the largest light bulb, rated at 75000 watts, was lit at the Rockefeller Center in New York, to commemorate the 75th anniversary of Edison’s first light bulb. The huge bulb was 3-1/2 ft high and about 2 ft in diameter. From high above, it illuminated the entire skating rink. It was allowed to cool for five minutes after burning for three minutes. In Jan 1879, at his laboratory in Menlo Park, NJ, Edison had built his first high resistance, incandescent electric light, though its thin platinum filament in a glass vacuum bulb burned for only a few short hours. He then tested thousands of substances before coming up with a more useful carbon filament which he presented in a public demonstration of his light bulb on 31 Dec 1879.
For Photos see HERE
All the Best
Colin
Question is: Why they made it for 115v instead of higher voltage?