50,000 Watt Incandescent Bulb.
Needs 416 Amps at 120 Volts
My electric cost is 13.7 cents per KWH, if I calculated this right, it
will cost $68.50 to run this bulb for one hour.
On Sat, 21 Feb 2015 13:43:09 -0600, firstname.lastname@example.org wrote:
You slipped a decimal point. It's $6.85 per hour but that is still a
lot of money if multiplied by 12 hours per day and 30 days per month!
The article was interesting, but the writer made a few strange
assumptions. The most obvious is his statement that lamps like these
are need for "airport lighting". Huh? If he had seen an airport from
high altitude, he would have noticed they look dark compared to the
surrounding area. Unless you are close to being lined up with a
runway at a fairly low altitude, you can't even see the runway lights.
On Saturday, February 21, 2015 at 6:01:37 PM UTC-5, Pat wrote:
Funny, I didn't read the whole thing, but the only two examples I
saw where they showed it being used was at lighting demonstration shows.
Even where you need a lot of lighting, I can't imagine an application
where you'd want it in one bulb, as opposed to many bulbs spread out
to light a larger area. I bet they didn't sell many.
On Sun, 22 Feb 2015 15:00:07 -0600, email@example.com wrote:
50 kW AM radio stations have electric bills like that, too - only 24
hrs/day (and even more because transmitters aren't 100% efficient). I
specified AM because FM stations and TV stations up their power using
high gain antennas. A 50 kW FM station might have a 1 kW transmitter
feeding an antenna that has a gain of 50, but a "clear channel" (as
they used to called before a company started using that name) AM
station really has a 50 kW transmitter along with the $5,000 per month
electric bill just for the transmitter.
The article was written in 1932. Airport lighting was much
Of course even modern airports have lighting other than the runway lights
(tarmac lighting, terminal lighting, beacon lighting) that require high
On Monday, February 23, 2015 at 1:25:25 PM UTC-5, Pat wrote:
I agree having multiple sources much smaller than 50KW is the approach used.
I doubt that 50KW bulb was actually used for anything, even in 1932.
The only examples I saw given were at lighting demonstration shows. IDK
what kind of beacon lighting he's talking about either. I've been to
a lot of airports around the world and have never seen such a light,
which would be impossible to miss.
Since beacon lighting was brought up, lighthouses come to mind. They
are the classic example of a beacon. I just checked what Sandy Hook,
at NY harbor uses. It's 1000W with a lens and can be seen for 19 miles.
On Sat, 21 Feb 2015 22:21:37 -0800, "Malcom \"Mal\" Reynolds"
That's insane!!! 7000 watts x 39 bulbs is 273,000 watts. And I thought
50,000 watts was crazy! This would require around 2300 amps (at 120
volts), but I bet they use a higher voltage.
I have no idea how to determine the amount of water it takes to generate
the electricity required for these lamps? How can that be figured???
To reverse this information, I was trying to estimate how many average
homes could be powered by 273,000 watts. Of course that would only be
an average, since every home is different, but looking it from the point
of AMPS, (2300 amps @ 120v). I'd guess that few homes are using over
50amps (at 120V) at once. Add in the 240 volt appliances, and 'Normal'
home exceeds 100 amps, (since many homes have 100A service). So if each
home averages no more than 50 amps at once, you could power at least 46
homes. (but probably more like 70)...... (just a guess.....).
I've always wondered how much energy one turbine at a power source can
produce? But that's where things get real complicated, because they
produce much higer voltages, which are stepped down using transformers,
and there is line loss to consider. And it's produced in THREE PHASE,
Plus I'm sure there are bigger and smaller turbines in use. So I doubt
no one other than someone working at the source really could answer
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