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LIGHT IXC. WITH INCANDESCENT LAMPS
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hand, it is heavy, liable to breakage, and expensive. Etched aluminum is nearly as efficient as glass, light in weight, and relatively inexpensive. However, the roughened reflecting surface, incidental to the etching or production of the matte finish, accumulates dirt easily and the aluminum reflectors must be cleaned rather frequently to maintain their good efficiency. The reflecting efficiency of chromium is about three-fourths that of silvered glass; however, it maintains this efficiency over long periods of time. Chromium-plated reflectors are relatively light in weight and of course are not subject to breakage. They are satisfactory for studio lighting service. Both the silvered glass and the chromium plated reflectors possess specular reflecting
Fig. 4.
A "Dome" general lighting unit, frequently necessary where the scene is shot simultaneously from several directions
characteristics; therefore, the surface should be configurated or rippled to remove striations and improve the uniformity of the illumination.
Overhead Units (Scoops)
For the deeper sets, overhead units are needed to direct light to the rear areas that cannot be illuminated satisfactorily by the broadsides. If the light output of the latter were increased sufficiently to provide ample light in the rear, the illumination intensities nearer the front would be undesirably high, so that it would be difficult to obtain satisfactory contrasts with the modeling lighting.
Since the overhead units are placed across the set similarly to the floor broadsides, we find here also that the 60-degree horizontal and vertical distributions adequately meet the requirements, thus permitting the use of a symmetrical reflector similar in contour to the