Business Energy, May 2014, by Brent Protzman.
http://www.businessenergy.net/DE/Articles/Alleviate_Your_
Energy_Woes_With_Wireless_Lighting_25497.aspx


"Commercial buildings in the United States have an installed base of 2.1 billion lamps—80% of which are linear fluorescent lamps. Despite the fact that lighting control strategies, including dimmers, occupancy sensors, timers, daylighting controls, and energy management systems (EMS), are acknowledged to yield very significant energy savings, fewer than 31% of these lamps are associated with any type of lighting controls in the field (Ashe et al. 2012)."