On the Economical Operation of Light Bulbs

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Briar Lee

Lifer
Sep 4, 2021
4,960
14,359
Humansville Missouri
About fifty years ago my dear teachers at Humansville, taught us little hillbillies to always use the lowest watt light bulb practical for the application.

At the time electricity was something like 3 cents a kilowatt hour and the savings from using a 75 watt bulb instead of a 100 watt bulb or a 40 watt instead of a 60 watt didn’t sound like much in a short time, but over the life of the bulb added up to where the dimmer bulb paid for itself several times over the life of the bulb. And, the brighter the bulb the more it cost and the less life it had.

And if building a new home or replacing a light fixture, the savings from florescent lighting were even greater.

Being of a Scottish descent, I’ve paid heed to those lessons and all my life since I’ve tried to economize on light bulb wattage, although I’ve blown any savings I had on other articles like Marxman pipes, raising children, and buying insurance.:)

I suppose all my childhood teachers are still right in their teachings, but would you look at how long a modern, cheap, 8.5 watt (60 watt equivalent) LED light bulb lasts and how little juice it uses compared to the high efficiency curly cue CFL bulb or old fashioned incandescent.

Xxxx


Cost Comparison Between LEDs, CFLs, and Incandescent Light Bulbs​

LEDCFLIncandescent
Light bulb projected lifespan25,000 hours10,000 hours1,200 hours
Watts per bulb (equiv. 60 watts)8.51460
Cost per bulb$5$2$1
KWh of electricity used over 25,000 hours212.53501500
Cost of electricity (@ 0.10 per KWh)$21.25$35$150
Bulbs needed for 25,000 hours of use12.521
Equivalent 25,000 hours bulb expense$5$5$21
Total cost for 25,000 hours$26.25$40$171
Energy Savings over 25,000 hours, assuming 25 bulbs per household
Total cost for 25 bulbs$656.25$1000$4275
Savings to household by switching from incandescent bulbs$3618.75$3275


Think of all the extra pipes I could have bought, if they’d have had modern light bulbs back when I was young.:)

And that chart is out of date already, as to the cost of the new LED bulb.

New 60 watt eq. (9 watt) LED bulbs are just over $2

IMG_5489.jpeg
 
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Scottmi

Lifer
Oct 15, 2022
4,034
58,858
Orcas, WA
If you still hold with incandescents, a trick that works out where we have some occasional 'fluctuations' in our power, is to use 130v rated bulbs. Built a little sturdier and not run at their 'peak' so tend to last a lot longer. Especially nice in the fixtures that are more of a hassle to change.
 
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Briar Lee

Lifer
Sep 4, 2021
4,960
14,359
Humansville Missouri
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Briar Lee

Lifer
Sep 4, 2021
4,960
14,359
Humansville Missouri
If you still hold with incandescents, a trick that works out where we have some occasional 'fluctuations' in our power, is to use 130v rated bulbs. Built a little sturdier and not run at their 'peak' so tend to last a lot longer. Especially nice in the fixtures that are more of a hassle to change.
I’m old enough to remember kids coming into barber shops and other businesses selling extra long life light bulbs for a dollar as part of school fund raiser projects.

What those bulbs were that gave them extra life was they had extra thick filaments.

I used to use them for difficult to change bulbs in places like over head lights in a basement staircase.

But they burned more juice, probably 100 watts instead of the lower light output they produced.
 
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Briar Lee

Lifer
Sep 4, 2021
4,960
14,359
Humansville Missouri
If I'm looking for something, I turn on the lights but usually I just use candles at night for reading and keep the lights off during the day.
I ain’t that Scottish.:)

But the local Amish near Dunnegan do not use electric lights at all. It’s all candles, kerosene lamps, and gas mantle lighting.

If you put a pencil to it, electric lights have always been cheaper. But since the electrics are so much more convenient we “English” waste a lot more light than we need.
 

Briar Lee

Lifer
Sep 4, 2021
4,960
14,359
Humansville Missouri
I love the new LED bulbs. Besides their efficiency, they're also housed in plastic and don't break when you drop them (as I have)!

All the household LED bulbs do is replace perfectly good incandescent bulbs at a fraction, about seven times less, to operate and a lifespan about twenty five times more.

Where LED bulbs are truly revolutionary is in outdoor street lighting.

The local electric coop replaced the dusk to dawn light at my oldest home I own that my grandparents built in 1931 and the new LED replacement makes it look like an helipad lit up at night compared with the old sodium vapor bulb.

And the coop says the new one is much more efficient, as well.
 
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Briar Lee

Lifer
Sep 4, 2021
4,960
14,359
Humansville Missouri
More about outdoor lighting and the LED bulb.

Until I was about five or six years old my father had a 150 watt light bulb on a switch on the top of the telephone pole (that’s still there) outside his milk barn. The local coop would replace the bulb as needed. Back then a man climbed the pole,

It gave out whatever lumens of light a heavy duty 150 watt outdoor bulb gives out.

The electric coop had a program where for $3 a month they’d install a dusk to dawn mercury vapor light and replace it at no cost when needed. The first night we saw that new light we knew that prosperity and progress had surely blessed the Ozarks.:)

It was many times brighter than the old 150 watt bulb.

Sixty years later, the coop still charges $3 a month but the new 150 watt lights they install to replace the old lights are much brighter and better lighting than the improvement over the old light bulb to the mercury vapor. They use a lift bucket truck now instead of climbing poles.

If you buy one yourself they are about $100. The utlities buy them in carload lots for less, no doubt.

50,000 hours and 21,000 lumens

And the light color is bright as day, 5,000 Kelvin

IMG_5490.jpeg

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lraisch

Part of the Furniture Now
Jul 4, 2011
735
1,532
Granite Falls, Washington state
Light pollution is increasing with the availability of cheaper, more efficient light sources. About 30% 0f vertebrates and 60% of invertebrates are nocturnal. Light pollution is an environmental stressor that is quite recent in evolutionary terms and is a problem for astronomers as well. This could be minimized if we use LEDs that eliminate the blue component and provide a warmer, amber illumination.
 

mso489

Lifer
Feb 21, 2013
41,211
60,638
I think shopping for light bulbs has become esoteric. Do you go for low cost, longevity, the color of the light given off which can make a room look inviting or awful, and so on. Little guidance is offered at retail stores, and most of us proceed by trial and error, with lots of errors. You read the pitch on the package and take your chances, and when you come back for more (when you do) those bulbs are no longer available. Dimmable, non-dimmable, daylight, bug light, and who knows what. It's a new experience every time you screw in a bulb.
 

warren

Lifer
Sep 13, 2013
12,358
18,570
Foothills of the Chugach Range, AK
Luckily, I'm not into saving the planet so, I purchase the bulbs which provide what I need and/or desire. Light pollution can be a problem when I'm out with my telescope. If it is, I move to another spot. But, I live in a sparsely populated, mostly, area so, it's not usually an insurmountable problem.
 
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newbroom

Lifer
Jul 11, 2014
6,379
10,018
North Central Florida
I've switched all my household bulbs to LED for several years now. I live in a rather temperate climate and appreciate the cooler operation. Much less heat involved. I've even got some LED lights designed to promote photosynthesis. They're fantastic!
 
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Briar Lee

Lifer
Sep 4, 2021
4,960
14,359
Humansville Missouri
Turn an incandescent on and ... leave it on (added: Where practical.). I've got four, low wattage bulbs, headed for six years, this winter, which have made it through earthquakes and door slams. I read somewhere, an Edison original made a couple of decades or so. Someone else will need to back me up on this one.

As my dear teachers explained, so many years ago, as I remember it is that all light is created by heat.

The sun is out there 93 million miles away producing light by the heat of a sustained nuclear fusion reaction.

Your 25 watt bulb has an element that uses 25 watts an hour of heat.

If juice is 10 cents a kilowatt, you can leave your 25 watt bulb burning for 40 hours for a dime.

Every time you turn off and start an electric light bulb that heats up the element and shortens the life of the element a wee little bit.

But the average life of a 25 watt bulb is 3,000 hours, to save a little on bulbs, and let’s say they cost a dollar.

In 125 days,,,four months,,,your dollar light bulb burns out. That’s a dollar.

But it costs $7.50 of electricity to heat up that filament for 3000 hours.

There’s an old saying the light is not worth the candle, which meant that when candles were very expensive it was best to save the candle and not waste light.

New 3 watt LED bulbs produce the same light as a 25 watt incandescent.

The LED is not harmed in the least by turning off and on (heat is too low).

An average life of a 3 watt LED is maybe 50,000 hours instead of 3000.

And it uses 8 times less juice.

Plus the new LED bulb is two dollars and something, and getting cheaper every year.

There’s no savings in old technology, but that’s always been true.

The old time 25 watt bulb was much, much cheaper in all ways, than a candor.
 

El Capitán

Lifer
Jun 5, 2022
1,174
4,848
34
Newberry, Indiana
I ain’t that Scottish.:)

But the local Amish near Dunnegan do not use electric lights at all. It’s all candles, kerosene lamps, and gas mantle lighting.

If you put a pencil to it, electric lights have always been cheaper. But since the electrics are so much more convenient we “English” waste a lot more light than we need.
It's just how I grew up. Dad was anal about electricity usages. I enjoy the nice glow of candles though.
 

mso489

Lifer
Feb 21, 2013
41,211
60,638
The color tones of different light bulbs can make a room look inviting or awful. Some "daylight" bulbs are cold as ice in effect, whereas others are sunny and pleasing. I'd sample a particular brand of bulb before buying in quantity, just like pipe tobacco blends.
 
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