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BOCC <br /> 7 <br /> Page 6 <br /> October 14, 1993 <br /> Example Project: replacement of existing T-12 florescent tubes <br /> and ballasts with T-8 florescent tubes and <br /> - electronic ballasts in one hundred two-lamp <br /> fixtures <br /> Five year total operating cost for 100 two-tube fixtures <br /> utilizing T-12 lamps and "energy savings" ballasts <br /> Electricity consumption costs <br /> 5 years x 50 weeks x 5 days x 11 hrs/day = 13, 750 hours <br /> 100 fixtures x 2 lamps x 75 watts/hr = 15,000 watts <br /> 15, 000 watts x 13, 750 hrs. /1000 watts/kilowatt = <br /> 206,250 kilowatt hours (kwh) <br /> 206,250 kwh x $0.075 per kwh = $15,468. 75 <br /> Typical maintenance/replacement costs <br /> "Energy saving" ballast replacement labor cost <br /> 100 ballasts x 1 hr @ $20.00/ hr. = $2000.00 <br /> "Energy saving" ballast replacement material cost <br /> 100 ballasts @ $13.00 ea. = $13,000.00 <br /> Total 5-year operating costs <br /> T-12 lamp 5-year operating cost total = $30,468. 75 <br /> Five year total operating cost for 100 two-tube fixtures <br /> utilizing T-8 lamps and electronic ballasts <br /> Installation cost <br /> Materials costs: <br /> 200 T-8 tubes @ $2 .00 ea. = $ 400. 00 <br /> 100 electronic ballasts @ $18.50 ea. = 1850. 00 <br /> material total = $ 2250. 00 <br /> Labor cost: <br /> 50 hours @ $20.00/hr. ( salary & benefits) = $ 1000. 00 <br /> Lost value of exiting materials: <br /> 200 tubes @ $1.00 ea. x 50 % remain. life = $ 100 .00 <br /> 100 ballasts @ $13.00 ea. x 50% rem. life = $ 650 .00 <br /> lost materials value total = $ 750.00 <br /> installation cost total = $ 4000. 00 <br />