A student committee whose main duty is changing light bulbs may sound like the punch line to a bad joke, but as the students and faculty at Montgomery County Public Schools (MCPS) in Rockville, MD, know, changing a light bulb is no laughing matter. As part of the district's green initiative, all standard incandescent and fluorescent light bulbs must go, and careful planning must be done to ensure that not one old bulb in the district's 200 schools is left behind. Even the illuminated exit signs must be tallied. Once inventory is complete, the old bulbs will be replaced by a variety of energy-efficient lighting alternatives, including individual task lamps, LED lighting, and good old-fashioned daylight. This article describes an MCPS initiative called the School Eco Response Team, through which each school in the district receives personalized guidelines for energy usage and is rewarded for achieving those goals each semester. The article also describes the Great Seneca Creek Elementary School, Maryland's first LEED (Leadership in Energy and Environmental Design)-certified elementary school. These initiatives demonstrate that what MCPS has done is involve its students in tasks that could have easily been assigned to building maintenance, but in so doing, the students have changed the whole culture of energy use throughout the district, providing them with lessons to last a lifetime.