The IES Lighting Handbook is a comprehensive resource published by the Illuminating Engineering Society (IES). It serves as a guide for professionals in the lighting industry, providing essential information on lighting design, technology, and applications. The handbook covers various topics, including lighting calculations, fixture selection, and energy efficiency. This handbook is regularly updated to reflect advancements in lighting technology and best practices. It is widely used by architects, engineers, and designers to ensure effective and sustainable lighting solutions in various environments, from residential to commercial spaces.