Integrated systems utilizing the heating potential of lighting equipment are discussed in terms of the implications for design and the methods for evaluation and control. General principles cover heat transfer, heat from lamps and luminaires, and control of lighting heat. Suggested systems include--(1) total control systems, (2) bleed-off systems, (3) separate systems, and (4) water and air systems. All electric system components such as heat pumps and electric supplementary heating are also described. Extensive use is made of illustrative photos, schematic drawings, and charts showing heat and light outputs of different lamps, and heat transfer with different exhaust methods. (MM)