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166SUM01.XLS <br /> General Storeroom Lighting Retrofit <br /> gel; 3/1b from Incandescent to High Pressure Sodium <br /> 49° <br /> Case Study Removed 408,Incandescent luminaires totalling 81.6 KW <br /> and replaced with 228, High Pressure Sodium luminaires <br /> totalling 29.6 KW. Electrical demand was reduced by 52.0 <br /> 0r with an estimated annual saving of$12,221. All work was <br /> �' performed by physical plant personnel including both <br /> 44.Cal design and installation. <br /> Energy Profile <br /> Original System!Incandescent New System/High Pressure Sodium <br /> Cost per KWH $0.08 Cost per KWH $0.08 <br /> Daily Hours/Operation 10 Daily Hours/Operation 10 <br /> Days per Year/Operation 280 Days per Year/Operation 280 <br /> Annual Hours/Operation 2,800 Annual Hours/Operation 2,800 <br /> Number of Luminaires 408 Number of Luminaires 228 <br /> Equivalent Lamp Wattage 200 Lamp Wattage Each 100 <br /> Equivalent Ballast Wattage 0 Ballast Wattage Each 30 <br /> Total KWD 81.6 Total KWD 29.64 <br /> Annual KWH 228,480 Annual KWH 82,992 <br /> Annual Energy Cost $19,192 Annual Energy Cost $6,971 <br /> Net Annual Savings $12,221 <br /> Implementation Cost $51,500 <br /> Payback/Years 4.21 <br /> Internal Rate of Return 24% <br /> Energy Investments that Beat the DOW <br />