Abstract
The conventional method of lighting a motion picture set is described, together with the illumination levels needed and the spectral distribution of the light, and from these factors the general requirements are deduced for lighting fittings using tungsten filament, carbon arc and high pressure mercury vapour discharge lamps. A more detailed account is then given of the way in which each of these sources is employed in order to satisfy the general requirements. The design of prismatic lenses, external attachments for light control, efficiency and colour of high intensity arcs, the double negative arc, operational requirements of discharge lamps, and thermal and mechanical design problems are discussed. They show what is accepted good practice at the present time and where future development may occur. A short closing section on supplies for studio lighting discusses the effect of ripple in the electrical supply voltage on generating noise in the flame of a carbon arc.
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