Calculating energy costs.?
Long question, I’ll try to make it short.
Costco sells these LED flood light bulbs that use 5 watts of electricity, but give off the equivalent of a 60 watt bulb. The LED bulb costs $15.00 (total including tax) while a old fashioned incandescent flood light bulb costs $5.00 (also total price including tax)
The LED flood light bulb claims to last 10 times the life of the incandescent bulb. And electricity rates are about 13 cents a kilowatt hour where I live.
How long will it take for the LED light bulb to pay for itseff if used 12 hour a night Say from 7.00 PM to 7.00 AM
electric costs 13 cents KWH, LED energy usage 5W VS. Incandescent 60W
Thanks. I really suck at math. Is it worth it to get many of those expensive LED bulbs to put up all over?
Sorry, I forgot to mention, I want to make it an even comparison, I want to compare an old fashioned 60W flood light bulb and a LED flood light bulb that uses 5W but gives off 60W worth of light.
1 Day Usage Incandescent
60W X 12h X $0.13/kWh X 1kWh/1000Wh = $0.0936 per day
1 Day Usage LED
5W X 12h X $0.13/kWh X 1kWh/1000Wh = $0.0078 per day
So using the LED bulb instead of the Incandescent will save you $0.0858 per day, but you’ll have to invest $10 ($15-$5) more up front. How long will it take you to make back your initial investment? $10/$0.0858 = 116.55 days (about 1/3 of a year). This is called the simple payback point.
But there is another important factor, the life of the bulb. Generally incandescent bulbs are rated to last about 3000 hours, while LEDs can last 30000 hours. You leave this light on 12 hours a day, or 4380 hours a year. This means the LED will last 6.85 years (30000/4380), while the incandescent would have to be replaced about every 8 months. In other words, you will have bought 10 incandescent replacement bulbs before you have to buy 1 replaced LED.
OK, lets put it all together. 10 year costs for LED vs. Incandescent
Incandescent: $0.0936/day X 365day/yr X 6.85 + $5/bulb X 10bulbs = $234.02 (for the electricity) + $50 (for the bulbs) = $284.02
LED: $0.0078/day X 365day/yr X 6.85 + $15/bulb X 1 bulb = $19.50 (for the electricity) + $15 (for the bulb) = $34.50
All in all, you would save $249.52 over the course of 10 years by purchasing the LED bulb! Hope this helps
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