Discusses research undertaken to determine recommended levels of lighting for effective seeing. Factors considered include age, veiling reflections, brightness differences, glare, and pleasantness. Also points out some common lighting practices that are wasteful and inefficient and suggests alternatives. (DN)

High intensity discharge lighting sources share the compactness and beam controllability of incandescent sources, but are far more efficient and longer-lived. They share the efficiency and long life of fluorescent sources, but are compact and optically controllable, and are available in higher wattages. (Author/MLF)

The author coordinates the many diverse branches of knowledge which have dealt with the field of lighting--physiology, psychology, engineering, physics, and architectural design. Part I, "The Elements of Architectural Physics", discusses the physiological aspects of lighting, visual performance, lighting design, calculations and measurements of…

The electromagnetic environment has a great amount of influence on the existence of life and man. The main points of concern are--(1) that sea-level solar radiation is biologically beneficial and necessary for man's physical and mental health, (2) that urban man has inadequate exposure to certain wavelengths of ultraviolet light normally received…