This book contains data and graphs pertaining to home energy usage, including natural light, light bulbs, and appliances commonly found in the office and living room. Graphs show light output, magnetic fields, and heat emitted by 8 light bulbs tested alone and in combination. Readings from computers, computer monitors, and appliances provide complementary data. This data can be used for lesson plans by teachers and parents. Bonus Material: Pictures of light bulbs provide additional information about energy-efficient design.