Welcome to the Ready Reference App, This Guide supports all basic lighting concepts and supporting all lighting applications is a body of “core knowledge,” information that the lighting designer needs to understand in order to execute a successful lighting design, one that will meet the needs of its intended users. the principles of quality lighting; the physical principles of lighting, including reflection and refraction; the physiology of human vision and related topics, including color and glare; lighting equipment, including light sources, lighting controls, and luminaire classification systems; and practicalities of lighting design, including energy, economics, sustainability, and maintenance.