This activity introduces users to the basic concepts of light, followed by several simulations that model the interactions of light with matter. It is designed for use in an introductory physics class or courses relating to biotechnology and nanotechnology careers. Users investigate the wave nature of photons, view models of light/matter interactions, and explore how light energy is converted into heat energy. They may also create their own model photon beam and generate an absorption spectrum. This item is part of the Concord Consortium, a nonprofit research and development organization dedicated to transforming education through technology. The Consortium develops deeply digital learning innovations for science, mathematics, and engineering. The models are all freely accessible. Users may register for additional free access to teaching guides and capability to capture data and store student work products.