Abstract
This paper describes a simple graphical means of calculating the candle-power distribution in a plane perpendicular to the axis of the source(s) of any lighting fitting which employs fluorescent lamps and specular trough reflectors. The method is derived from considerations of the geometrical and optical properties of reflecting systems in conjunction with the lamp. In order to save time and labour in the initial stages of the design of fittings, an instrument has been developed to facilitate the graphical work. All that is necessary for the polar curve to be found is a cross-section drawing to scale of the proposed optical arrangement.
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