Leukos, The Journal of the Illuminating Engineering Society of North America, the society's research publication, is now making one article from its current issue available online for free. The current issue is Vol. 8, No. 3, Jan. 2012, and the available article is "Lighting Controls in Commercial Buildings" (ies.org/leukos/samples/1_jan12.pdf). This paper discusses how researchers have been quantifying energy savings from lighting controls in commercial buildings for more than 30 years, and it provides an analysis of lighting energy savings identified in the literature—240 savings estimates from 88 papers and case studies, categorized into daylighting strategies, occupancy strategies, personal tuning, and institutional tuning.