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Silver Lake Road LED Street Light Improvement Project February 28, 2017 Page 2 K:\02170-270\Admin\Docs\MEMO-LED Street Light-021317.docx light pole bases will be reused; therefore, no additional light standards will be added. In addition, the light heads on the mast arms over the signalized intersections will be replaced with 4000k LED rectangular light heads. The signal poles and mast arms will remain in place. This segment is a 50/50 shared segment between the City of St. Anthony Village and the City of New Brighton. The third segment has the same characteristics as the second segment in both existing conditions and proposed lighting. Since this segment is entirely within the City of New Brighton there will be no cost to the City of St. Anthony Village. Color temperature describes how yellow or blue a light source appears. The unit of measurement for color temperature is “Kelvin” (k). Low color temperatures describe yellowish light, and high color temperatures describe bluish light. The LED street light fixtures come in 3 different color temperatures (3000k, 4000k and 5000k). As previously stated the existing lights along Silver Lake Road are high pressure sodium which has a color temperature of 2200k. The following chart is provided to help visually compare color temperatures. When LED’s first came out the color temperatures were in the 5000k-6000k range, which gave off a bluish tone. Advances in the industries have improved the color and efficiencies. The majority of street lights installed by MnDOT today are 4000k color intensity. Attached to this report are pictures of 3000k and 4000k lights that are installed in the City of Minneapolis. In one of the photos of the 4000k overhead lights, the lower lantern lights are HPS lights. It is hard to tell the difference in these photos but the 3000k lights are a bit ‘softer’ light. These photos were taken on N. Washington Ave at 9th Avenue North looking north (4000k) and south (3000k). There is virtually no price difference between the different heat intensity fixtures for this application. The types and intensity of the LED fixtures were chosen to replicate the lighting that currently exists along these segments. As noted in the first paragraph, 3000k LED lights will be used in the decorative Vernon style lights and 4000k LED lights will be used in the overhead lights. 38