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Public Works Department <br />Memo <br />To:Jesse Freihammer, Public Works Director <br />From:Erik Henricksen, Assistant City Engineer <br />Date:October 7, 2025 <br />Re:Streetlight Illuminance Study – Fulham Street and South 36 Service Drive <br />1 Purpose <br />The purpose of this memorandum is to document the methodology, standards, and <br />framework for a streetlight illuminance study in the areas of Fulham Street and South <br />Highway 36 Service Driveand Marion Road and South Highway 36 Service Drive conducted <br />on September 29, 2025, between 9:40 PM and 9:53 PM. On July 14, 2025, City Council <br />directed Public Works staff to conduct anevaluationto determine whether existing <br />conditions provide sufficient lighting for a local residential roadwaygiven the nearby <br />existing Highway 36 and I-35 lighting. These streetlight locations were planned for <br />installation in 2025 in accordance with the City’s existing Streetlight Policy for Standard <br />Districts.The City’s Streetlight Policy for Standard Districts requires streetlights at <br />intersections and pedestrian crossings to enhance community safety; however, the policy <br />does not establish specific illuminationthresholds. Accordingly, this evaluation references <br />industry standard criteria adopted by the Illuminating Engineering Society of North <br />America (IES) for roadway lighting. <br />2 Equipment <br />Illuminance measurements werecollected using an ExtechLT300 Light Meter, which <br />records light intensity in foot-candles (fc). This instrument provides results consistent with <br />established engineering standards. The LT300 has a measurement range of 0.00 to 20,000 <br />foot-candles, with an accuracy of approximately ±3 percent under standard lighting <br />conditions. It is capable of detecting very low levels of light with a resolution of 0.01 foot- <br />candles (fc), which is important for evaluating residential streets where illumination levels <br />are relatively modest. The unit is equipped with a cosine and colorcorrected sensor, <br />meaning it is designed to approximate how the human eye perceives light from different <br />angles and sources, thereby producing readings that more accurately represent real-world <br />conditions. <br />Page 1 <br />Qbhf!278!pg!:15 <br /> <br />