Change A Light Day is observed on October 5th and encourages individuals to switch from incandescent lightbulbs to energy-efficient LED bulbs. This initiative aims to reduce electricity consumption, lower utility bills, and minimize environmental impact. By changing just one lightbulb, participants can significantly decrease their carbon footprint and contribute to energy conservation. The day originated in Kentucky, where it was first proclaimed to promote the use of Energy Star models. Typical actions include purchasing LED bulbs and replacing the most energy-consuming lights in homes. Celebrants are also encouraged to share the importance of this change with friends and family, fostering a collective effort towards energy savings and environmental protection.