Spark Lighting was a contributor to The U.S. Department of Energy and Navigant Consulting for the 2015 U.S. Lighting Market Characterization report. The 2015 U.S. Lighting Market Characterization (LMC) is the third report released by the U.S. Department of Energy’s (DOE’s) Solid-State Lighting (SSL) Program that provides summary estimates of the installed stock, energy use, and lumen production of all general illumination lighting products operating in the U.S. The objective of this report is to collect and present in one document the fundamental energy consumption information that DOE needs to plan an effective lighting research and development program. The estimates were developed through industry surveys, building audits, interviews with industry experts and building audit data.