When Mexico’s trust fund for electricity energy savings introduced the luz sustentable (sustainable light) program in mid-2011, its primary aims were to promote a more efficient use of electricity, develop a vibrant market for energy efficient technologies, and contribute to global climate change mitigation efforts. Energy sector management assistance program (ESMAP) helped make Mexico’s record breaking feat possible by producing the compact fluorescent lamps (CFL) toolkit used by planners in the design phase of the sustainable light program. CFLs offer significant opportunities for developing countries to reduce energy consumption in the residential sector, thereby providing a range of major benefits to consumers, utilities, governments, and the environment.