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Tool Talk Discussion Forum

Heating with light bulbs

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Crem

01-25-2004 08:53:18




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My brother does not have any animals in his dairy barn over night. Consequently he has to provide some heat in the barn to keep the water from freezing. He has been using an electric heater on each end of the barn but decided to try a propane heater. The heaters run about 10 hrs a night when it is cold out. The propane proved to be very expensive because he was probably heating the barn more than he had to. He pays about 7 cents a KW for electricity, so 2 kw/hr for the two heaters costs $1.40/day. On colder days he could use third heater. If he turned on his ten 100 watt barn lights, which would add one more kw/hr, would this be the same as adding another 1000 watt heater or is some heat energy lost in the light output? I thought that I would ask for some opinions on this. I think that a fan would also help to keep the heat down from the ceiling.

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Chuck MI

01-26-2004 16:16:14




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 Re: Heating with light bulbs in reply to Crem, 01-25-2004 08:53:18  
An alternative to the light bulb, which can, and will, burnout, is a small heater that screws into a standard bulb socket. I had one at the previous greenhouse I worked at. I think it was purchased at either Grainger or an electric supply house. It had been working for at least 8 years when I left, probably still working today.



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Tim in OR

01-25-2004 20:00:06




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 Re: Heating with light bulbs in reply to Crem, 01-25-2004 08:53:18  
I have used an old set of large bulb Xmas lights to keep my pumphouse from freezing. Its 39 outside now and probably about 75 in the pump house. A good use for old style lights. Tim



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John Nelson

01-25-2004 19:35:03




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 Re: Heating with light bulbs in reply to Crem, 01-25-2004 08:53:18  
Enegry used to produce heat converts back to heat when it hits a wall or anything. One watt of electrical enegery produces 3.412 btu. Enegry cant be destroyed, just changed. Watts = Volts X Amps. Electric motors or appliance produces heat equivilant to the equation minus the mechanical enegry. Hope this helps.
John
P.S. Our propane is aprox 92,000 btu per gal



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Crem

01-25-2004 19:44:59




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 Re: Re: Heating with light bulbs in reply to John Nelson, 01-25-2004 19:35:03  
Thanks John, Does that mean that ten 100 watt bulbs will produce the same amount of heat as one 1,000 watt resistance heater?



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big fred

01-25-2004 19:54:18




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 Re: Re: Re: Heating with light bulbs in reply to Crem, 01-25-2004 19:44:59  
Yes, that's what he means. Of course you would subtract the energy in any light that goes out the window, but that will be a tiny amount of the total.



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rhudson

01-25-2004 17:30:25




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 Re: Heating with light bulbs in reply to Crem, 01-25-2004 08:53:18  
A friend of mine wires two bulbs in series then plugs them into a freeze thermostat. his thinking is that he can cut down on the wattage each bulb is putting out there by increasing bulb life. the problem i see is that if one bulb burns out, both go out.



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Gene Davis (GA.)

01-25-2004 18:22:46




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 Re: Re: Heating with light bulbs in reply to rhudson, 01-25-2004 17:30:25  
I have 2 100 watt light bulbs that my father wired in series in 1977, the only time they have been off were the power outages and the 1 hour they were moved to my shop when we sold the home place and they are still going today. He did this to show our preacher if they connected the stair/exit lights in the buildings this way they would last longer. Now both men are gone and the bulbs are still going strong! They make a good night light in the shop and put out almost no heat. Have instructed my daughters to keep them on as long as they burn if they out last me. Gene Davis

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bcPA

01-27-2004 12:05:02




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 Re: Re: Re: Heating with light bulbs in reply to Gene Davis (GA.), 01-25-2004 18:22:46  
You gave me a idea. My friend has some 24 volt halogen tractor lights he bought at a auction, thinking they were 12 volt. He was looking to trade them for some thing he could use. What would happen if he wired them in series on his skid loader? Thank you in advance.



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bcPA

01-27-2004 15:17:12




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 Re: Re: Re: Re: Heating with light bulbs in reply to bcPA, 01-27-2004 12:05:02  
nevermind. I was thinking backwards. two six volt lights might work on a 12 volt systyme, but not 2 twenty four volt lights on a 12 volt tractor.



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William

01-26-2004 01:57:43




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 Re: Re: Re: Heating with light bulbs in reply to Gene Davis (GA.), 01-25-2004 18:22:46  
good story, nice post.



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buickanddeere

01-25-2004 19:25:36




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 Re: Re: Re: Heating with light bulbs in reply to Gene Davis (GA.), 01-25-2004 18:22:46  
Running at 1/2 of thier design voltage lowers the filament temp and it's deteriation. Lumens of light per watt of power input will suffer. We put 75W 240v bulbs in exit light fixtures intended for 25W 120v lamps. Other than being pink, they will last decades as long as the bulbs metal/glass seal holds.



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Rauville

01-26-2004 03:34:53




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 Re: Re: Re: Re: Heating with light bulbs in reply to buickanddeere, 01-25-2004 19:25:36  
I use Westinghouse Commerical Service 130 volt bulbs around the house and outbuildings. The specfications for 100 watt are: @ 130V, 100W, 1230 Lumens, 5000 Hour life. Operated @ 120V, 88W, 925 Lumens, 14000 Hour life. Lower the voltage by 8% and increase the life by 280%! I've always been surprised that people don't spend the .89 for these bulbs, instead of the cheap ones that don't seem to last.

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Irv

01-25-2004 13:55:26




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 Re: Heating with light bulbs in reply to Crem, 01-25-2004 08:53:18  
My grandfather kept his water pump from freezing for years with a 100 watt bulb in a enclosure that just covered the exposed pump and pipe. The enclosure was made of plywood & insulation.



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Kevin

01-25-2004 15:03:08




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 Re: Re: Heating with light bulbs in reply to Irv, 01-25-2004 13:55:26  
Thats what I do to keep the water on at the cottage deep into December, however, learn from my friends misfortune, use two or three 60 watt bulbs instead. Guess what happens when a single 100 watter burns out! Lol!



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VADAVE

01-25-2004 09:28:49




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 Re: Heating with light bulbs in reply to Crem, 01-25-2004 08:53:18  
I keep the lawn building warm enough to pevent freezing with 2 light bulbs. Works fine till the power goes off--and it always does during a bad storm. I wouldn't heat the whole barn--frame off the part with the water in it and put the bulbs in there. Another alternative is the run a heat tape along the pipes and wrap with insulation. Again works till the power goes out.



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