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AMERESCO4 <br />Green . Clean . Sustainable <br />Exterior Lighting Retrofit Strategy: <br />- Existing high pressure sodium flood fixtures, high pressure sodium shoebox fixtures, high <br />pressure sodium bollard fixtures, metal halide flood fixtures, and T8 lamp troffers were <br />replaced with new LED fixtures. <br />Lighting Control Strategy: <br />- Wall and ceiling mounted occupancy sensors were installed in appropriate areas. An <br />appropriate area for occupancy sensors is defined as an area that contains several <br />controllable fixtures, has intermittent occupancy, and where a safety hazard will not be <br />created if the sensor inadvertently turns the light off. Typical areas include service corridors, <br />storage areas, restrooms, and offices. <br />How Savings Were Determined —The savings were initially determined by utilizing wattages provided by <br />the manufacturers and data from past projects. Additionally, burn hours were assumed through <br />information provided by facility personnel, industry standards, and site data collection. These variables <br />were used to calculate the electricity consumption and demand savings from reducing lighting wattage in <br />the facility. <br />Measurement and Verification — The M&V approach for the Lighting Upgrades ECM is based on IPMVP <br />Option A. This approach consists of taking measurements of actual wattage consumption on a sample of <br />the most common fixture types installed as part of this project. The electrical contractor utilized a true <br />RMS meter to obtain these measurements. <br />Once measurements of actual fixture wattage were obtained, Ameresco grouped the fixture types <br />together and calculated the actual wattage associated with specific fixture types. These wattages were <br />then inserted back into the original spreadsheet calculations to determine the Actual Savings. A table of <br />the lighting measurements is included in the Appendix. <br />Since wattages are very consistent and burn hours do not change from year to year, the savings will be <br />realized throughout the full term of the guarantee as long as the city continues to repair burned out <br />fixtures with the same lamps and ballasts that were installed as part of this project. <br />October 15th, 2024 <br />Page 8 <br />