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lesliemorris85
Starting Member

USA
14 Posts

Posted - 02/13/2013 :  9:55:33 PM  Show Profile  Visit lesliemorris85's Homepage  Reply with Quote
How much energy does energy saving lighting save?

stusviews
Moderator

USA
15603 Posts

Posted - 02/14/2013 :  12:41:49 AM  Show Profile  Visit stusviews's Homepage  Reply with Quote
How much wood does a woodchuck chuck?

Other than that, use arithmetic. A 10 watt bulb that replaces a 20 watt bulb uses half the electric. A 5 watt bulb wold use one fourth the electric. LEDs and CFLs multiply the saving

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jdale
Advanced Member

USA
1205 Posts

Posted - 02/15/2013 :  08:14:11 AM  Show Profile  Visit jdale's Homepage  Reply with Quote
This site gives a nice summary of the impact of changing the type of light bulb you use. A little simplistic but easy and clear.

http://environment.nationalgeographic.com/environment/energy/great-energy-challenge/light-bulb-savings-calculator/

Insteon FAQ: http://goo.gl/qNTNr
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Geo
Advanced Member

Canada
732 Posts

Posted - 02/15/2013 :  11:01:00 AM  Show Profile  Reply with Quote
There's a lot more to it than just calculating watts.
The heat generated by light bulbs is not lost, but it contributes to heating of your dwelling. So, unless you live in an area where you don't need to heat your house at all, what you save on lighting you may have to spend on heating.
Another issue is the total energy spent, which includes the energy going into manufacturing the light source. A while ago I posted here an article from the Department of Energy on the subject. The CFLs were, compared with the incandescents significantly worse, the LEDs worse even more. The cost of disposal of materials used in the CFLs and LEDs is another story.
CFLs exhibit a miserable power factor plus significantly shorter life if operated for short periods of time. You may be operating a 60W bulb in some locations for just a few seconds at a time, while the CFL, taking 17W, would not even warm up in that time and should be running for 10 to 15 minutes. Where's the saving then?
And we should not forget that reducing the carbon footprint at home while pushing it to another country is no solution in terms of the global ecology. So, in conclusion, I would quote stusviews: "how much does a woodchuck chuck?"

GJN
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jdale
Advanced Member

USA
1205 Posts

Posted - 02/15/2013 :  3:12:23 PM  Show Profile  Visit jdale's Homepage  Reply with Quote
quote:
Originally posted by Geo

The heat generated by light bulbs is not lost, but it contributes to heating of your dwelling. So, unless you live in an area where you don't need to heat your house at all, what you save on lighting you may have to spend on heating.


Or, conversely, you may have to spend more on air conditioning to remove the excess heat from your home. I suspect that, considered over the whole country, this approximately cancels out, although it certainly depends where you live.

Even if I consider that heating is an advantage where I live (it probably is for me), if I think of 90% of my lighting bill as actually a heating bill since ~90% of the power is producing light and not heat, it's heating at a higher expense per unit of heat than my actual heating system. This only applies if you don't have oil or electric heat though.

Insteon FAQ: http://goo.gl/qNTNr
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lesliemorris85
Starting Member

USA
14 Posts

Posted - 02/18/2013 :  11:07:06 PM  Show Profile  Visit lesliemorris85's Homepage  Reply with Quote
quote:
Originally posted by jdale

This site gives a nice summary of the impact of changing the type of light bulb you use. A little simplistic but easy and clear.

http://environment.nationalgeographic.com/environment/energy/great-energy-challenge/light-bulb-savings-calculator/



Thanks a lot for this jdale ...
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Geo
Advanced Member

Canada
732 Posts

Posted - 02/20/2013 :  09:38:19 AM  Show Profile  Reply with Quote
I think I read, but can't find the article at the moment, that about 60% of the energy ends up as heat. Regardless of that, fluorescents and LEDs are more efficient, as light sources, than incandescents, so that's where the future lies. Putting a realistic number to the possible savings is another story. It depends on who the authors of the reports are or who has financed the research. It only confirms the Britain's Prime Minister Disraeli's statement over 100 years ago that "there are lies, damned lies and statistics".

GJN
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Geo
Advanced Member

Canada
732 Posts

Posted - 02/20/2013 :  09:47:54 AM  Show Profile  Reply with Quote
Beware of simplistic explanations - they may be skewed by the writers' agenda. Sometimes a detail left out for being seemingly unimportant may cause problems down the road. A good example is the current concern that white LEDs, because of their spectrum in short wavelength, not sufficiently filtered, cause color fading of works of art in museums (see Electronics Design Magazine).

GJN
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jennygoose
Starting Member

USA
1 Posts

Posted - 03/03/2013 :  10:09:27 PM  Show Profile  Reply with Quote
Though we use CFL's nowadays for saving electricity but most of the people all over the world are not much caring about energy saving they forget to switch off electrical equipments on time which causes more waste of energy.
Kitchen is the power house of every home and hence there is a huge scope for saving energy in kitchen operation. Nowadays people are install lighting in their kitchen rta cabinets which is an extra burden for energy sources.
The RTA Store.

Edited by - jennygoose on 03/04/2013 10:03:20 PM
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scottharrison
Starting Member

USA
3 Posts

Posted - 03/04/2013 :  03:26:48 AM  Show Profile  Visit scottharrison's Homepage  Reply with Quote
quote:
Originally posted by lesliemorris85

How much energy does energy saving lighting save?



You can do some experimenting in your home to answer your question. Try to observe how much kilowatt/per hour does a CFL consume and for the non-energy saving light bulb. Then, you can figure out how much energy would energy saving lighting saves.
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Norman Tebbit
Starting Member

1 Posts

Posted - 04/11/2013 :  8:55:37 PM  Show Profile  Reply with Quote
nice national geographic link - here's another with a bit more specifics involved - and it's very interesting indeed!
http://www.ledcanada.com/calculator/
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justin
New Member

USA
16 Posts

Posted - 04/02/2014 :  10:23:41 PM  Show Profile  Reply with Quote
I read in some magazine that LED bulb saves 400 kilowatt hours of electricity compared to the CFL and 2,700 kilowatt hours compared to the incandescent bulb.
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milesblewett
Starting Member

Australia
5 Posts

Posted - 04/09/2015 :  12:34:08 AM  Show Profile  Reply with Quote
The power consumption of the actual LED is in the case above about 3.5 watts whilst the rest of the power goes into recharging the battery and the circuit. This part of the consumption would be identical to fluorescent tube emergency lights. Fluorescent tubes are of course already quite economic, so the energy saving of LED versus fluorescent tubes is only in the range of 2-10 watts. However, the real saving from LED emergency lights comes from not having to replace the tubes on a half yearly or yearly basis. The LEDs will last a lot longer, hence saving costs for maintenance call-outs and replacement tubes. The actual energy saving depends also from whether an emergency light is maintained or non-maintained.
A particular cost efficient combination is self-testing LED emergency lighting which minimises any maintenance costs and inspection effort to a minimum.
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Samara
Starting Member

1 Posts

Posted - 08/26/2015 :  11:28:05 PM  Show Profile  Reply with Quote
There existed some new design to calculate the energy consumption for each of your facility and device in your home,and what's more it can work as a circuit breaker also when suffer some short circuit.

contact samara at shanghaimeter@gvrpower.com

www.gvrpower.com
quote:
Originally posted by lesliemorris85

How much energy does energy saving lighting save?

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Kyile Rey
Junior Member

Canada
34 Posts

Posted - 06/14/2016 :  03:40:47 AM  Show Profile  Visit Kyile Rey's Homepage  Reply with Quote
Compact Fluorescent Lamps (CFLs) and Light Emitting Diodes (LEDs). CFLs are a cost-effective option for most general lighting requirements. Replacing a traditional light bulb with a CFL of the same brightness will save you about 3 per year, or 50 over the lifetime of the bulb.
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TimK
Starting Member

11 Posts

Posted - 03/23/2017 :  08:07:19 AM  Show Profile  Reply with Quote
LED lighting saves quite a bit of energy:

Bathroom: 360W down to 36W, 3 hours per day = saves 355 kW-hr/year
Kitchen: 700W down to 90W, 8 hours per day = saves 1782 kW-hr/year

That's about $250/year in direct savings not including the savings due to reduced A/C use in the hot months.
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