The Cost of Keeping a 100 Watt Bulb on for 1 Yr. Non-Stop

 
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lsayre
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Post by lsayre » Tue. May. 17, 2016 6:31 pm

Hambden Bob wrote:Crap ! Larry,Ya got me,Lock,Stock and Barrel !

You gotta get up pretty late in the afternoon to pull one over on my unsuspecting and easily duped rear-end......!

I don't think that 100 watter and it's support hardware would survive the burn season so well

Oh well,atleast the yearly cost has tumbled downward,and coupled with a lower watt use attempt,I think price cuts have been achieved ! Whallah !! :dancing: :up:
Yes, you would probably be changing out the 100 Watt incandescent bulb about 6 times per year.


 
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Post by Lightning » Tue. May. 17, 2016 7:16 pm

It was stated that a CFL that is as bright as a 100 watt incandescent will emit the same amount of heat and only use 25 watts. I'm not able to agree with that. I couldn't find any heat comparisons online but it's well documented that CFLs radiate much less heat than an incandescent.

There's no free lunch when creating heat with electricity. You need the incandescent bulb.

 
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Post by Rob R. » Tue. May. 17, 2016 7:30 pm

lsayre wrote: you would probably be changing out the 100 Watt incandescent bulb about 6 times per year.
For those of you looking for long-life bulbs, check out Aero-Tech bulbs. They make 20,000 hr rough service incandescent bulbs, and I have used them with great success in some tough applications. e.g. My dad used to go through bulbs every couple months in his garage...about 7 years ago I gave him two Aero-Tech bulbs...they are still working. Made in USA! :)

Larry, here is one for you...how much does it cost (same electrical rate as above) to run a 175w Mercury vapor dust-till-dawn light for a year? You will need to factor in the variable amount of time it is on per day throughout the year, and the efficiency of the ballast. 8-)

 
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Post by lsayre » Tue. May. 17, 2016 7:51 pm

I found this on the net:

Fixture Type 175W MV
Bulb Wattage 175
Ballast Wattage (% of Bulb) 14.5%
Total Fixture Wattage 200

If you make the assumption of an average of 12 hours of use per day, it should cost the same as a 100 Watt incandescent that is running round the clock.

 
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Post by Rob R. » Tue. May. 17, 2016 7:57 pm

I already knew the wattage draw and could have flat-lined it at 12 hour per day...but I figured I would keep you busy for an hour or so by looking up the sunrise and sunset times for a particular zip code. :P

I have two of those Mercury lights in operation...I keep telling myself I should unhook one of them, but I've tried it a few times and miss the illuminated driveway and path to the shop.

 
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Post by Lightning » Tue. May. 17, 2016 8:14 pm

I don't think it matters for any particular latitude. It works out to average 12 hours of light and dark per day over the course of a year anywhere. Doesn't it? lol

 
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Post by davidmcbeth3 » Tue. May. 17, 2016 8:34 pm

I slapped in some 300W new bulbs for the 100W old ones in my garage ...


 
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Post by Sunny Boy » Tue. May. 17, 2016 9:31 pm

Lightning wrote:It was stated that a CFL that is as bright as a 100 watt incandescent will emit the same amount of heat and only use 25 watts. I'm not able to agree with that. I couldn't find any heat comparisons online but it's well documented that CFLs radiate much less heat than an incandescent.

There's no free lunch when creating heat with electricity. You need the incandescent bulb.
Lee.
".almost as much heat.." is not the same as, "same amount of heat". :D

But, I stand corrected on wattage. I just dug out of my GE 100w equivalent CF bulbs and they are 40w. And, if you doubt how much heat they produce, grab hold of a compact fluorescent after it's been on for about ten minutes and you'll see just how hot they get. ;)

Paul

 
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Post by lsayre » Tue. May. 17, 2016 9:35 pm

The '100 Watt equivalent' LED bulbs seem to come in at about 16 Watts.

I had a 100 Watt equivalent CFL bulb in our chicken coop, and it was rated at 27 Watts. Replaced it with a 60 Watt equivalent LED bulb drawing 10 Watts.
Last edited by lsayre on Tue. May. 17, 2016 9:42 pm, edited 2 times in total.

 
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Post by Lightning » Tue. May. 17, 2016 9:41 pm

Yes I agree they get warm but they don't throw any where near the amount of infrared radiation as an incandescent. Hold your hand 12 inches from a 100 watt incandescent and you can actually feel it. :)

 
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Post by Sunny Boy » Tue. May. 17, 2016 9:44 pm

Lightning wrote:I don't think it matters for any particular latitude. It works out to average 12 hours of light and dark per day over the course of a year anywhere. Doesn't it? lol
There's slightly more daylight hours than dark in a year. Because of atmospheric affects there is slightly more daylight hours than night time hours. The affect is even greater the closer you get to the poles. Check out where it says, "Daytime duration".

https://en.wikipedia.org/wiki/Sunshine_duration

Paul

 
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Post by Sunny Boy » Tue. May. 17, 2016 9:48 pm

Lightning wrote:Yes I agree they get warm but they don't throw any where near the amount of infrared radiation as an incandescent. Hold your hand 12 inches from a 100 watt incandescent and you can actually feel it. :)
In a confined space it'll still heat the air. Not all heat given off is in the upper ranges. Just like sunlight heat after it comes through window glass and hits a surface. It changes to low wave heat energy that won't pass as easily back out through the same glass.

Paul

 
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Post by Sunny Boy » Tue. May. 17, 2016 9:49 pm

lsayre wrote:The '100 Watt equivalent' LED bulbs seem to come in at about 16 Watts.

I had a 100 Watt equivalent CFL bulb in our chicken coop, and it was rated at 27 Watts. Replaced it with a 60 Watt equivalent LED bulb drawing 10 Watts.
The 100w equivalent Cree LEDs I have say 18W on them. They are the 5000 K "bright white" type.

Paul

 
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Post by Lightning » Tue. May. 17, 2016 9:59 pm

Sunny Boy wrote:Check out where it says, "Daytime duration".
Hey that's pretty neat.

 
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Post by waldo lemieux » Wed. May. 18, 2016 8:09 am

The whole discussion around energy saving lightbulbs (led or cfl) is all about heat. The reason they are more efficient is that they generate less heat / lumen. so if its heat you want your best bet is an incandescent bulb. I don't know what percentage electricity is used to make the light , in this case useless , but it seems to me that a ceramic heater or other heat only device must be the most efficient.... :gee:


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