My math is not good enough to figure this out. On the electric bill I figure out that it is costing at about .11 9/10 cent per killowatt. What I do not know how to go from there is to figure out what it costs to operate each of these bulbs for a 24 hour period. 100W incandesecant, 23W CFL, 13W Cfl or 14.5W LED or 9W led or a 7W night light. What formula do I need to figure this out? Just bought some LED 9 Watt and 14.5 watt. Going to try to see if the LED lights up faster in the cold than the CFL or as fast as the incandesicant. And just wondering what it is costing me to leave on that night light or the 13W CFL full time. The others are only as needed. Does not look like much difference if I would switch the 13W CFL to a 9W LED left on in kitchen-living room full time. I have had the LED night lights and they do not make enough light for me to see at night to get to bathroom.
- Thread starter Leroy
- Start date
dr sportster
Well-known Member
What is the rate per kilowatt hour on your bill . A figure that is decimal and fraction does not compute with me. { .11 9/10s ? that figure.]
Janicholson
Well-known Member
The decimal point in your question should be two places to the right. and the 9/10 should be a plane 9 being 11.9 cents per KW hour. The light output of each of those types of bulbs is very different. Look at the lumens (on the box/packaging) The LED will produce the most light per watt. The 7 watt light bulb probably the least. Jim
BarnyardEngineering
Well-known Member
- Location
- Rochester, NY
Watt x Hours / 1000 = Kilowatt-Hours
Kilowatt-Hours x rate = cost
It will be directly proportional to how many Watts each light bulb draws. 7W will be cheapest. 9W will be slightly more expensive. Then 13.5W, 14W, 23W. 100W will be most expensive.
Kilowatt-Hours x rate = cost
It will be directly proportional to how many Watts each light bulb draws. 7W will be cheapest. 9W will be slightly more expensive. Then 13.5W, 14W, 23W. 100W will be most expensive.
You pay by the kilowatt hour. That's the juice required to run a 1,000 watt (something) for one hour. So, one kilowatt hour would run 10 100 W lightbulbs for one hour.
So, in a day, your 100W bulb used 24 x 100 or 2400 Watt-Hours or 2.4 Kilowatt hours. If your price is .119 per, that's 28.5 cents
If the 23W CFL draws 23W (my newer bulbs have two numbers on the packaging, something like 53.3 is the new 80, looks like an 80 W but costs like a 53.3), but assuming 23 W, one day is 552 Watt hours, 0.552 KW-hours, or 6.5 cents
13 W -> 3.7 cents
14.5W -> 4.1 cents
9W -> 2.6 cents
7W -> 2 cents
and that's my 7W worth. John will be along shortly to fix any typos or mistakes!
Bob
So, in a day, your 100W bulb used 24 x 100 or 2400 Watt-Hours or 2.4 Kilowatt hours. If your price is .119 per, that's 28.5 cents
If the 23W CFL draws 23W (my newer bulbs have two numbers on the packaging, something like 53.3 is the new 80, looks like an 80 W but costs like a 53.3), but assuming 23 W, one day is 552 Watt hours, 0.552 KW-hours, or 6.5 cents
13 W -> 3.7 cents
14.5W -> 4.1 cents
9W -> 2.6 cents
7W -> 2 cents
and that's my 7W worth. John will be along shortly to fix any typos or mistakes!
Bob
Larry EC-OH
Member
Bob, You have it right.
Another formula that might be simpler is: C = wtr/1000
Where C is Cost in cents; w = watts; t = time in hours; r = electric rate in cents/kw hour
So figuring the 100 watt bulb for 24 hours with a rate of 11.9 = 28.56 cents or $0.29 rounded.
Larry
Another formula that might be simpler is: C = wtr/1000
Where C is Cost in cents; w = watts; t = time in hours; r = electric rate in cents/kw hour
So figuring the 100 watt bulb for 24 hours with a rate of 11.9 = 28.56 cents or $0.29 rounded.
Larry
Thanks, I think I can figure it out now. The 23W CFL is equivilent to the 100 watt incandesant and the new LED are at 14.4 watt be equivilent to th 100 watt incandesant. and the 13W CFL or the 9W LEd equivlent to the 60 W incandesecant. I still have several of the old 100 watt bulbs along with the 60watt. I have put some CFL in outside and when they warm up make good light, just that someplaces when you turn on a light at night you do not want them to have to warm up to see what is making noise outside of your door in the middle of the night. You want to see what is there just as soon as you hit that light switch.
And that 13 W CFL that I keep burning 24 hours a day is only costing me at a rate of 3.7 cents per day and to replace with the 9W LED at 2.6 cents per day I think it would take a few years to cover the cost to switch.
Have a lot of the CFL in the house as well as the tube type bulbs and there has been florsent lights in this house ever since it was wired in 1946.
And that 13 W CFL that I keep burning 24 hours a day is only costing me at a rate of 3.7 cents per day and to replace with the 9W LED at 2.6 cents per day I think it would take a few years to cover the cost to switch.
Have a lot of the CFL in the house as well as the tube type bulbs and there has been florsent lights in this house ever since it was wired in 1946.
Larry EC-OH
Member
I've had good luck with dual LED fixtures above my Overhead doors. Mine have sensors that turn them on and off automatically. I think there are 27 watts/fixture. I've had them up for two years, lots of bright white light (at least equivalent to a 100W probably closer to a 150W incandescent bulb, no problems.
I also have LEDs as outdoor lights. There is a half a second delay, but not really noticeable.
Larry
I also have LEDs as outdoor lights. There is a half a second delay, but not really noticeable.
Larry
K Effective
Well-known Member
As an employee of a fairly large electrical utility, let me suggest you replace ALL those bulbs with 300W incandescents, and leave them on at all times.
Thanks for your support.
:wink:
Thanks for your support.
:wink:
Now factor in the cost... $.5 for a bulb. 4 bucks for a cfl, and 20 bucks for an led...
That will confuse you some more...
and then factor in the useable light..
most leds are horrible and you cant see squat.. so why even turn them on... And you damn sure cant read with and led and some of the cfl's...
so where does that leave you??
K Effective
Well-known Member
I've been involved in replacing incandescents and CFLs at work with LED. We stress using the 5000K light rated ones, most white light. And use the largest bulb you can fit in the fixture- we have a lot of moisture proof ones, (bulb inside a jelly jar). The LED put out more light than CFL.
I tried two of the LED models in my cow barn, replacing 150W inc. They have a slight "delay" when turned on, like the circuitry needs to power on before it makes light. I have not yet had them over the winter to see how well they handle cold. They did well with the vibrations from loading/stacking hay on the loft above, much better than inc.
I tried two of the LED models in my cow barn, replacing 150W inc. They have a slight "delay" when turned on, like the circuitry needs to power on before it makes light. I have not yet had them over the winter to see how well they handle cold. They did well with the vibrations from loading/stacking hay on the loft above, much better than inc.
T in NE
Well-known Member
- Location
- Cambridge, Nebraska
Get the "daylight" LED bulbs. 10 watt LED vs 13 watt cfl, there is no comparison.
Figure in the expected life of the light, the LED would be worth the extra cost just for the convenience of not changing it so often.
Figure in the expected life of the light, the LED would be worth the extra cost just for the convenience of not changing it so often.
Larry EC-OH
Member
I'm really surprised that you can't see with LEDs.
My experience is the opposite, I can see much better with LEDs that any other light source expect sunlight. I think you need to get them as close to 5000K as possible, which is pretty close to natural sunlight.
Larry
My experience is the opposite, I can see much better with LEDs that any other light source expect sunlight. I think you need to get them as close to 5000K as possible, which is pretty close to natural sunlight.
Larry
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