New York Times, Nov. 25, 2016, by Diane Cardwell.
http://www.nytimes.com/2016/11/25/business/energy-environment/marijuana-legal-environment-lights.html?_r=0

[Subsidized by Puget Sound Energy], "Evergrow Northwest, a legal producer of recreational marijuana in Tumwater, Wash., is running an experiment, comparing using LED lights to grow cannabis with using more common high-pressure sodium bulbs."