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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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