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122 AMATEUR MOVIE MAKING
ing arrangement the lamp may be operated on either of two amperages. In case a lighting circuit is available which will not stand the full drain, the lower current pull is used at a sacrifice of initial illumination. These lamps usually consume 10-20, 12%-25 or 15-30 amperes. In any case, only the higher consumption, i.e., 20, 25 or 30 gives the full efficiency of the lamp. These lamps are ideal for commercial and industrial work in the studio, but should not be used on the high current pull by amateurs, unless an electrician certifies the electric installation to be heavy enough to bear the current drain of the specific lamp used. In case the circuit is certified for one or two lamps, do not think this evidence that it will stand three or four. Find out from your electrician just what current drain the circuit will stand and then keep the total amperage of all lamps used within this limit.
There are innumerable lamps of this type being manufactured, and new ones appear every day, so we shall discuss only some typical styles. THE GELB SPECTRO-SUNSHINE LAMP
This lamp lies midway between the type just described and the advanced amateur type, in that it is small, compact, may be hand held or used upon tripod. It may be packed "hot" immediately after use through the ingenious design of the lamp. Various types of carbons are supplied, including ultra violet for use with quartz lenses in ultra rapid photography. Size— In case 6*4 x 10y2 x 12i/2
In double case (Two lamps) 6*4 x 14 x 22 Weight — Single case 16 pounds Double case 32 pounds Tripod 3 pounds Stand — 7 feet maximum, tripod style, also low table stand
Type: — Twin arc
Voltage— 100-125 A. C. or D. C. Amperes — 10 and 20 Candlepower — 18,000 on 20 amperes Carbons — % x 12 upper % x 4 lower Both white flame photographic