Computer Aided Design Method to Predict the Luminous Intencity Distribution of Reflector Part 2

Abstract

In the previous paper, the author described the computer-aided design method to predict the luminous intensity distribution curves of simple reflectors.In this paper, CAD method on revolved parabolic reflectors with a high intensity discharge lamp is described in the development of the theory in Part 1.Quantities of the direct light and reflected light on the surfaces of the reflector are computed at various vertical angles, then two computed values are summed up to decide the luminous intensity.Most efforts are directed towards formulation of a computer program to calculate the intensity from reflected light component.The light emitteing surface of the lamp is dievided into many parts, light rays from each part are traced exactly in accordance with the reflection in properties of the reflector's finish.Then, shape of the reflector is designed such that as littl reflected light as possible may fall on to the lamp.In the application of this CAD method, sufficient results are obtained practically from many experimental measurements.Thus, new high efficiency reflectors have been developed by this method.