The original brass light fixture with four 60 W Candelabra incandescent bulbs cost $76.00. The bulbs had a poor life span and replacements would have cost about $60.00 over a 10 year period. Assuming a usage of two hours per day, the electric consumption for 10 years would have been 240 x 2 x 365 x 10 = 1,752 kWh @ $.14 = $245.
The total equipment and operating cost would have totaled $395 over ten years.
The new fixture cost $303 and will consume 62 x 2 x 365 x 10 = 453 kWh @ $.14 = $63.
The total equipment and operating cost will total $366 over ten years.
As you can see, the return on investment is almost 10 years and barely warrants the exercise and has to be chalked off as an interesting project.
A different story would emerge if the light fixture were to be used in an area where illumination is desired for all night hours (12 hours per day). Savings would be realized due to the reduced electric consumption as follows:
Old fixture: Cost $76 + $60 + Consumption $1’470 = $1’606 cost over ten years
New fixture Cost $303 + Consumption $376 = $681 cost over ten years.
This is more impressive since the savings would result in almost $1,000 for the period.