From NEMA’s ei magazine (p18 of the magazine, p20 of the PDF), article written by a Precision Paragon executive:
In 2010, the average cost per lumen of a commercial or industrial LED fixture was approximately 12 cents per lumen.
Today, that cost has dropped to approximately five cents per lumen, installed. While comparable fluorescent fixtures might cost three cents per lumen, the optical efficiency of LED lighting allows us to achieve the same lighting results with fewer lumens and far fewer watts.
Source: http://electricalcontractor.com/?p=15692
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