Blake Redfield
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ADVANCE FOR USE SATURDAY, MARCH 22 - In this photo taken on Wednesday, March 12, 2014, traffic system manager Blake Redfield attaches an LED streetlight to a motorized tower to raise it to light pole height to test its light output, beam spread and color in his lab at the Central Maintenance Building in St. Cloud, Minn. (AP Photo/St. Cloud Times, Jason Wachter) NO SALES
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ADVANCE FOR USE SATURDAY, MARCH 22 - In this photo taken on Wednesday, March 12, 2014, traffic system manager Blake Redfield moves a light sensor around on his light deck to measure a streetlights LED's light pattern and intensity around the light head in his lab at the Central Maintenance Building in St. Cloud, Minn. (AP Photo/St. Cloud Times, Jason Wachter)
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ADVANCE FOR USE SATURDAY, MARCH 22 - In this photo taken on Wednesday, March 12, 2014, traffic system manager Blake Redfield measures the color output of an LED streetlight to see where it falls between the yellow lamp bulb color most are used in homes and daylight which is more blue at the Central Maintenance Building St. Cloud, Minn. (AP Photo/St. Cloud Times, Jason Wachter) NO SALES
