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Report: LEDs Cut 570 Million Tons of CO2 in '17

12/27/2017 00:01 AM EST
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Bert22306
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LEDs are still the right idea
Bert22306   1/2/2018 9:34:29 PM
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Heat generated by incandescent bulbs may not always have been totally wasted, but it was almost always wasted. It is resistive heat, first of all, which is quite inefficient. In homes, better to save on that kind of heat, and use heat pumps or other methods, for heat. And in traffic signals, if you want to argue that heat from incandescent bulbs helped melt snow, true as that might be, it only applies for the relatively small amount of time, per year, when it's actualy snowing. Other times, it's just waste. Better use a separate system to melt snow, only when needed.

Plus, incandescents get really really hot, which always best to avoid.

The other aspect of this is that LEDs last a very long time, and as far as I can determine so far, also much longer than CFLs. I've had only one LED quit on me, no doubt the power supply. I've also dropped an LED flashlight once, but it kept working fine. Incandescent filaments tend to break, in similar circumstances.

And you can buy LEDs of different color, to meet your needs. The 2700K ones seem virtually identical to incandescent lights.

Of course, some people might be tempted to add brightness instead of purely saving energy. Overall, though, that's not an indictment of LED bulbs. More one of wasteful people. LEDs now sell for prices that have become thoroughly competitive with incandescent bulbs, especially when you figure in the much longer life, so hey, it's all good!

patrolg
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Reverse: not reduce
patrolg   12/28/2017 2:25:50 PM
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The key is not reducing, but REVERSING. Reducing is a surely a positive step. Our lungs and air does not need lesser CO2, but a purification (reversing). Do doctors, who see a patient who lack oxygen, give them lesser polluted air ?  Nature's renewal, as is, will take a very long time to reverse anything to suitable levels. 

apaDAV
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Re: Energy Efficiency Success Story
apaDAV   12/28/2017 4:53:30 AM
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"One might think that the big reduction in consumption by lighting and electronics would've led to a stark reduction in per-capita electricity consumption" : Light has never been one of the big items. Looking at the entire energy usage, it is less than 2%. Shaving 50% of 2% does not do much.

Evariste
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Re: Energy Efficiency Success Story
Evariste   12/27/2017 5:48:23 PM
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Those were pitiful.  The voltage regulator would step down the voltage by burning the excess as heat.  Inevitably the regulator or the massive transformer coils would melt down.

Evariste
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Re: Energy Efficiency Success Story
Evariste   12/27/2017 5:45:04 PM
One might think that the big reduction in consumption by lighting and electronics would've led to a stark reduction in per-capita electricity consumption, but the reduction is minimal.  The worst offender is the air conditioner, which has only gotten worse as houses have increased in size and more people have moved to locations where they never would have lived without AC.  Houses are getting less efficient, if anything.  The incentive structure is poor and there is little desire to invest money up front into efficiency.

Evariste
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Re: Heat not always wasted
Evariste   12/27/2017 5:36:23 PM
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I see that where I live.  On the days when the conditions are worst, some of the stoplights are completely obscured.  It seems like outright negligence not to have put a simple resistive element and temperature sensor on the face of the lamp.  

apaDAV
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Re: Other metrics
apaDAV   12/27/2017 4:03:19 PM
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Figures  1-2. and 2-1. on PDF-Pages 11 and 16Are even more clear.Only the newest LEDs are good enough to be more efficient than CFL. I always favored CFLs and there the ballast makes the difference. Just the big old heavy inductor is inefficient compared to a current limiting SMPS.

apaDAV
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Re: Heat not always wasted
apaDAV   12/27/2017 3:43:05 PM
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"I've read that the reduction in cost of light has resulted in more light being used, making the world even brighter.  In that respect LEDs are backfiring somewhat." That is what I immediately thought. I see it used as decoration and burning all night. Also the color tone is different to the Sodium lights that are being replaced with LEDs. Blue LEDs are used by some as decoration, I do not like it.

apaDAV
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Re: Energy Efficiency Success Story
apaDAV   12/27/2017 3:38:07 PM
AC adapters that used to get warm So true, they were such a pest, heavy and big too. Sometimes they even made audible noise.

cgervasi
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Energy Efficiency Success Story
cgervasi   12/27/2017 2:35:06 PM
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I'm surprised how non-engineers are not aware of this.  People think of reducing CO2 as requiring nothing but sacrifice.  But here is a case where huge amounts of energy are saved just by better technology.  There are similar stories everywhere: AC adapters that used to get warm even with no load, equipment going to sleep.  I think this partly why in my area they charge more for just having the electrical service connected.  It's easy for consumers to conserve, and when they do most of the cost is in maintaining the grid, not costs that vary with usage.  

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