2006-11-08 03:26:05 · 6 answers · asked by Anderlagiht 2 in Science & Mathematics ➔ Engineering
Rscanner is correct (and got a thumbs up) that any filament bulb operating at substantially lower voltage than normal WILL last almost indefinately.
In fact, decreasing the voltage of a bulb just 10% lower then usual will result in lifetimes of MANY times the usual.
Conversely, if you INCREASE the voltage just 10%, you may make a bulb that WOULD have lasted 1000 hours, last as few as 50.
This trade off is used for theatre lights, some projector bulbs and other lamps which required VERY high brightness. The bulb might be rated at 36Volts with an output of 500W. It may have a lifetime of 35 hours. This is because the bulb IDEALLY would be running at perhaps 32 Volts - but if over driven gives the brilliance that is required - at the expense of bulb life.
The "Heavy duty long life" bulbs used on construction sites usually have extra supports for the filaments BUT the main difference is that the filament is designed such that it will be running 5 - 10% under voltage when fed with 110V
People who have bulbs powered by dimmers - and nearly always have the bulb on LESS than full power - will often find many YEARS go by before they need to change the lamp.
Some LED's have claimed lifetimes of 100,000 hours. Some are rated even longer - such that they well outlive the purchaser!
2006-11-08 06:54:02 · answer #1 · answered by Mark T 6 · 1⤊ 0⤋
If you take a regular light bulb and run it at 1/2 the normal voltage, it will not be very bright, but it will last practically forever. Also LEDs last practically forever.
2006-11-08 11:31:11 · answer #2 · answered by rscanner 6 · 2⤊ 0⤋
Tomas Edisons original light bulbs still work, to this day.
2006-11-08 11:34:37 · answer #3 · answered by D 4 · 0⤊ 0⤋
yes, but no one will actually mass produce them, what would all the people when every one will have those light bulbs and there will be no need to produce more?
2006-11-08 12:39:50 · answer #4 · answered by fm290566 2 · 0⤊ 0⤋
We had a company that sold us some of those, and we had to change them like every 6 months, so I would say, they don't exist, it's just a farce...Do you really know of anything that last forever??
2006-11-08 11:35:26 · answer #5 · answered by Anonymous · 0⤊ 0⤋
I've heard of 7 year lightbulbs that you can get from places like Menards. Spirally things. Swirly.
2006-11-08 11:34:08 · answer #6 · answered by Answerer 7 · 0⤊ 0⤋