The more common units used for general production are (HI = high intensity):
The 150-ampere HI arc
The 120-ampere HI arc
The white-flame Twin Broad arc
Inky Sr. spotlight
Inky Jr. spotlight
Inky Baby spotlight
Among others less frequently used but in many cases no less important should be mentioned many special converted lamps, a 65ampere HI arc spot, and a 10-kw corrected inky lamp.
The light-sources used for photography might be classed in four general groups as follows:Daylight
High-intensity arc light
White-flame arc light
The daylight, of course, is our standard for color-temperature. The HI arc lights are all corrected for normal work with a Y-1 gelatin filter placed in front of the arc light. This filter was especially made for Technicolor, using a special non-fading yellow dye supplied by us. The exact filter strength is determined by camera test. The white-flame arcs were balanced to a daylight color-temperature by the National Carbon Company, and therefore require no filter of any kind. The incandescent lighting units must fulfill two requirements to meet the daylight color-temperature standard. They must first be equipped with incandescent bulbs burning at a color-temperature of 3380°K and second, they must be fitted with a tested Macbeth glass filter. All General Electric bulbs marked C.P. will burn with a color-temperature of 3380°K when operated at their rated voltage. It should be emphasized that the rated voltage must be supplied, and in the case of the arcs, the proper amperages and proper gap lengths and positions must also be maintained.
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