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468MV2MH.XLS <br /> Fetzer Gymnasium(s) (Lighting Retrofit <br /> A O from Mercury Vapor to Metal Halide <br /> 4 <br /> Case Study Removed 128,Mercury Vapor luminaires totalling 58.8 KW <br /> and replaced with 64, Metal Halide luminaires totaling <br /> 29.440 KW. Electrical demand was reduced by 29.4 KW <br /> with an estimated annual saving of$13,018. All work was <br /> VS1V performed by physical plant personnel including both <br /> 1081 + design and installation. <br /> Energy Profile <br /> Original System!Mercury Vapor New System!Metal Halide <br /> Cost per KWH $0.08 Cost per KWH $0.08 <br /> Daily Hours/Operation 16 Daily Hours/Operation 16 <br /> Days per Year/Operation 329 Days per Year/Operation 329 <br /> Annual Hours/Operation 5,264 Annual Hours/Operation 5264 <br /> Number of Luminaires 128 Number of Luminaires 64 <br /> Lamp Wattage 400 Lamp Wattage Each 400 <br /> Ballast Wattage 60 Ballast Wattage Each 60 <br /> Total KWD 58.9 Total KWD 29.44 <br /> Annual KWH 309,944 Annual KWH 154,972 <br /> Annual Energy Cost $26,035 Annual Energy Cost $13,018 <br /> Net Annual Savings $13,018 <br /> Implementation Cost $16,746 Estimate Number,446-0. <br /> Payback/Years 1.29 <br /> Internal Rate of Return 78% <br /> Energy Investments that Beat the DOW <br />