British Kinematography (1951)

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ho BklTlSH KINEtaATOGRAtHV Vol. IS, No. 2 ^ Table II shows the relative economy of the principal floodlights, but in this case the " Duarc,"2 which is taken as the standard, consists of two arcs in series; it is highly efficient, and no comparable improvement in efficiency is possible. TABLE III " Pandora and the Flying Dutchman" — Professor's Study Lamps Rigged Current 3 5 kW. Compact source floodlights... 210 32 2£ kW. Compact source floodlights .. 1120 2 225 A. H.I. Arc spots ... 450 56 150A. H.I. Arc spots ... 8400 3 120A. H.I. Arc spots ... 360 2 65 A. H.I. Arc spots ... 130 32 40A. H.I. Arc spots ... 1280 4 5 kW. incandescent spots 170 4 2 kW. incandescent spots 70 4 500w. incandescent spots 20 2147 500w. incandescent floods 10 12,220 amps. Cost of rigging lamps, cabling up and striking 8% Spot rail construction ... 5% Labour for operating lamps 33 ! Power used, 15,030 kwh (a 5.6d. per kwh 29% Cost of bulbs and carbons 25% 100% No. of davs 8 Total Burning time 30 hrs. Cost of Lighting a Set It is now necessary to show the relative importance of the various components of the cost of lighting a set, and the Professor's Study from "Pandora" has been studied for this purpose, with the result shown in Table III. It will be seen that the set is of about average size, and representative of current practice. The cost of rigging the lighting, and removing it all afterwards, amounted to 13% of the total cost, while the other three factors are of about equal importance. Table IV shows the lighting of this set as rigged. It will be seen that it comprised TABLE IV The Red Shoes " (Ballet Scene) Lamp As Shot Quantity Current Effect Spot ... 1 300 M.R. type 1450 ("Brute") In parallel 2 450 M.R. type 170 In parallel At 200 amps. At 150 amps. 12 71 2400 10650 M.R. type 90 In parallel ... 8 960 M.R. type 65 3 195 M.R. type 40 & 27 Twin Arc Floods 121 4840 Incandescent Spots 13 210 Total 231 20005 231 lights, having a total connected load of 20,000 amps. The choice of lights for a set depends on many factors besides that of economy. The first requirement is, of course, the perfect photographic result and everything must be subordinated to this end; but it is none the less instructive to consider what economies could be made. Choice of Equipment The main lighting consisted of 83 M.R. Type 170 arcs, 12 of which were over-run at 200 amps. The same total light output