For an upcoming article for Electrical Contractor Magazine, I recently had the opportunity to interview Mariana G. Figueiro, PhD, Director of the Light and Health Research Center (LHRC) and Professor in the Department of Population Health Science and Policy at the Icahn School of Medicine at Mount Sinai, and Professor Mark S. Rea. The topic: a new methodology (called SOWatt), which specifiers could use to evaluate the relative energy efficiency of luminaires in delivering circadian-effective light.