It is rather easy. Cost of electricity is $$$ per kilowatt hour. In my market it is around $0.10 Kw-hour. Others may be more, check you electric bill.
To figure take the bulb wattage i.e 40 watt. and multiply by the Number of hours used. i.e. 10 hours ... 40 watts X 10 hours = 400 watt-hours. Divide by 1000 to get kilowatt hours.... i.e. 0.400 kilowatt hours. Thus with electic at $0.10/ kw-hr., in a 10 hour day, one 40 watt bulb will cost you .4 X $0.10 = $.04 to run.
Now multiply that by number of bulbs and days of the year.
Savings is calculated the same way. 32 bulbs * 40 watts * 10 hours /1000 = 12.8 kw-hours/day
The proposed system is 16 bulbs * 23 watta * 10 hours /1000 = 3.68 kw-hours /day
a savings of 9.12 KW-hr every day. or at $.10 a KW-hour $0.92 a day => *7 = $6.39 week => * 52 = $331.97 a year => *4= $1327.88 over a four year life span of the bulb.
Like bank interest the power is in letting the small numbers build up over time.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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