ABSTRACT
Industry encompasses seeing tasks, operating conditions, and economic considerations of a wide range. Visual tasks may be extremely small or very large; dark or light; opaque, transparent, or translucent; on specular or diffuse surfaces; and may involve flat or contoured shapes. With each of the various task conditions, lighting must be suitable for adequate visibility in developing raw materials into finished products. The speed of operations may be such as to allow only minimum time for visual perception, and therefore lighting must be a compensating factor to increase the speed of vision.
