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New Portable High Intensity Arc Spotlight*
BY RUSSELL J. AYLING
STRONG ELECTRIC CORPORATION, TOLEDO 2, OHIO
Summary— The spotlight to be described includes many features which are the result of an extensive investigation of desirable characteristics in such devices. An integral transformer supplies low-voltage alternating current to the arc from any 115-volt, alternating-current outlet at a drain of only 10 amperes. A double-element variable-focus optical system allows the spot size to be continuously adjusted with negligible light loss.
INTRODUCTION
FOR MANY YEARS there has been a need in theatrical and allied fields for a lightweight portable spotlight of extremely high intensity. The operator either depended upon an incandescent or vertical arc-type spotlight for short projection distances, or the large theater-type spotlights which employ heavy rotating equipment and tremendous power consumption. The Strong "Trouper" designed for use in theaters, auditoriums, and night clubs is an answer to this need.
Featuring an automatic carbon feed, the new "Trouper" produces a brilliant white, uniformly illuminated, and clear-cut spot, which supplies that extra sparkle to a performance, obtainable only with the use of high-intensity carbon arcs. With a color temperature of approximately 5700 degrees Kelvin, as measured with an Eastman color temperature meter, the brilliancy of spot greatly surpasses any incandescent or vertical low-intensity carbon-arc spotlight and actually will equal many of the large high-intensity types.
The "Trouper," with a net weight of 215 pounds, has been developed with the thought in mind of simplicity, portability, and ease of operation. It takes a new operator only a few moments to master efficiently the operation of this well-balanced spotlight.
The power requirements are extremely modest. Drawing 10 amperes from a 115-volt outlet, the power rating is only 1 kilowatt. The following description of the design and operation of the "Trouper" covers (1) base and power supply, (2) lamp and optical system
* Presented June 10, 1949, at the Central Section Regional Meeting, Toledo, Ohio. 408 OCTOBER, 1949 JOURNAL OF THE SMPE VOLUME 53