New lighting technologies, their status and impacts on power densities

In the mid-70s, new products employing new technologies were developed that increased the efficacy of producing and distributing visible light. These included the high frequency operation of fluorescent lamps, replacement of incandescent light sources, and effective management of lighting. These technologies are described and their present status are discussed. Their impacts on energy use and on the quantity and quality of illumination is presented. It is shown that proposed lighting power densities of 1.5 watts per square foot for lighting can be realized.