American cinematographer (Jan-Dec 1963)

tion filming, TV film production, and industrial and in-plant motion picture photography. The Quartz-King reflector has been carefully engineered to gather up and project the maximum illumination output of the Q-I lamp — a small tubu¬ lar unit about 3-inches long and a half-inch in diameter and having the unusual ability to main¬ tain an undiminishing level of intensity and color temperature during its “rated” life. ColorTran has accomplished this by special texturing of the QuartzKing reflector surface and by positioning the lamp within the reflector to produce a light beam com¬ pletely free of hot spots, filament pattern or band¬ ing even when used as close as ten feet from the subject. The first Quartz-King unit — the “Quartz-King 650,” which was introduced a little over a year ago, utilized a 650-watt quartz-iodine lamp in a medium-flood housing and operated directly from standard household current. Unlike with ColorTran lamps, no power booster was required. Its pro¬ jected light beam was round rather than oval, which characterized some Q-I photo lights, and it pro¬ duced 390 foot candles of illumination at a dis¬ tance of ten feet. All pre-production tests of the lamp were made under carefully controlled labora¬ tory conditions with the Q-I lamp (a Sylvania DWY 650-watt, 3400°K) positioned ten feet from the test board. The line voltage was sustained at 120 volts with the aid of a Variac and 1% precision voltmeter. More recently, ColorTran has brought out its Quartz-King 1000, utilizing the more powerful 1000-watt Q-I lamp, and provided it with a range of accessories making it suitable for just about every lighting need of the small motion picture studio, in-plant and industrial film producer, and on-location filming of interiors by major studios. The lighting unit which this report is intended to specifically examine is the newest of all QuartzKings — the Quartz-King Dual— which is available in both 650-watt and 1000-watt sizes. What makes the “Dual” different from the Quartz-Kings which preceded it is, that incorporated in the housing is a two-position mounting for the Q-I tubular lamp unit. With the lamp mounted in the forward posi¬ tion — on the first pair of clip-on contact pins — the light pattern produced by the Dual is a wide flood (see Figs. 2 and 4). When mounted in the rear position — farther back in the housing — the light pattern produced is a medium flood. Chang¬ ing position of the Q-I lamp takes about two sec¬ onds. The pins are spring-loaded and the lamp easily snaps into the selected position. Of course, to change the lamp during use, it must be allowed to cool sufficiently for handling. As with the “650” and “1000,” the quartz-iodine lamps used in the “Dual” operate directly from Continued on Page 178 FIG. 3 — Graphs below show relative light intensities of both the Dual 650-watt and Dual 1000-watt Quartz-Kings with the Q-I lamp in for¬ ward and rear positions and with and without the intensifier accessory in place. References A, B, C, and D correspond to similar references in illustration below. Fig. 4. FIG. 4 — Diagrams below show graphically the relative differences in the light beams and foot candle output of the Quartz-King “Dual” photo light with the Q-I lamp in the front and rear position and with the addition of the intensifier. Wide Flood (Lamp in forward position) 220 foot-candles, Dual-650 400 foot-candles, Dual-1000 Wide Flood, Intensified (Lamp in forward position, with intensifier skirt) 430 foot-candles, Dual-650 620 foot-candles, Dual-1000 Medium Flood (Lamp in rear position) 390 foot-candles, Dual-650 850 foot-candles, Dual-1000 Medium Flood, Intensified (Lamp in rear position, with intensifier skirt) 640 foot-candles, Dual-650 1035 foot-candles, Dual-1000 AMERICAN CINEMATOGRAPHER, MARCH, 1963 163