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1950-51 Theatre Catalog, 9th Edition, Page 279 (257)

1950-51 Theatre Catalog, 9th Edition
1950-51 Theatre Catalog
1950-51 Theatre Catalog, 9th Edition, Page 279
Page 279

1950-51 Theatre Catalog, 9th Edition, Page 279

the answer. This simple illustration indicates the general procedure followed to determine the size and characteristics of the fioodlight needed to satisfy the conditions at hand. In general, it is advisableto build up the required illumination by overlapping beams, so that, a dark spot is not created if a lamp outage should occur.

The Use of Color

When skillfully handled, color may to used to glamourize the night-time appearance of a building quite effectively. For example, blue light provides relief lighting or illuminated shadows; green light suggests coolness; red light simulates warmth, etc. Color must be coordinated with the architectural motifs and may be made changeable if appropriate. Mobile color and Variation in intensity by dimming create alluring effects whose possibilities have only been touched upon.

In order to obtain colored light from iloodlights using filament lamps, colored door glasses are used which absorb that part of the spectrum other than the color desired. The colored light thus transmitted is in the order of 50% for amber, 20% for red, 10% for green, and 5% for blue; it is, therefore, necessary to compensate for these lower light outputs, if the resulting illumination is to be comparable to that obtained with clear light. As a rule, if colored light is provided in these relative wattage values

as compared to clear light, the results will be satisfactory: Amber 1.5; red 2; green 4; and blue 6.

Calculation of Cost

It is hazardous to estimate the cost of noodlighting a theatre facade without detailed knowledge of its construction and the opportunity it presents for floodlighting. However, since cost is always an important consideration, an example to indicate the magnitude of the initial investment and operating expense may not be too far afield from a typical case.

If we assume that a facade has a 100foot frontage, is 50' in height, is faced with light gray limestone, and fronts on a well-lighted business street, the connected load required to provide an illumination of 20 footcandles is approximately 15 kilowatts. The hours of operation will probably average 2,000 hours per year which, with power at $.02 per kilovatt hour, would show an annual power cost of $600, or $.30 per hour. While it is true that the initial cost of such an installation will vary widely in individual cases, it would, under favorable conditions, probably run in the neighborhood of $2,500, or $.50 per square foot of facade.


(ll Footcandlc is the unit of illumination when the foot is the unit of length. It is the illumination on a surface one square foot in area on which is uniformly a flux of one lumen and equals lumens per square foot.

(2) The lumcn is the unit of luminous flux. lt cquals the flux emitted through a unit solid angle (one srcradianl from a point source of one candle,

THEATRE BUILDINGS. The Paramount Theatre and Office Build ng (above) caps the brilliance of New York's Times Square. The swank Rivoli Theatre, New York. displays its classic facade.

1950-51 Theatre Catalog, 9th Edition, Page 279