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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