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Architectural
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Historical Articles: Floodlighting Equipment - 1931
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Floodlighting, strictly defined, is the lighting of objects or areas with units having a wide distribution of light and placed close to the objects to be lighted. By common usage, however, floodlighting has come to mean something almost the opposite--namely, the lighting of objects or areas with units having a relatively restricted distribution of light and located at some distance away from the objects to be lighted. Hence it is essential that the reflectors used in floodlighting units have specular reflecting surfaces to control the light and redirect it in well-defined beams.
Typical Floodlight Projectors
MAZDA Lamps for Floodlighting
The size of the light source is an important factor in determining the beam spread and efficiency of a reflector. For concentrated beams of less than about 15 degrees spread, there is available the MAZDA Floodlight lamp, characterized by a dosely coiled filament, a short light center length, and a round bulb of comparatively small dimensions. This concentrated filament approaches the ideal point source of light, while the small bulb minimizes the amount of light which the reflector directs back through the glass of the bulb, with resulting absorption. Floodlight lamps may be burned in any position except within 45 degrees of the vertical, base up.
For applications requiring a beam spread greater than about 15 degrees, there is no particular advantage in an extremely concentrated light source; the General Service MAZDA lamp, in a pear-shaped bulb and with a relatively large filament, is entirely satisfactory. Not only is the General Service lamp satisfactory in these wider beam spreads, but it also allows for a greater flexibility as regards intensities because a range of wattage can generally be used in any given equipment. Lamps of this type have the further advantages that they have a longer rated life, and cost less.
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500-watt
MAZDA Floodlight Lamp |
1000-watt
General Service MAZDA lamp |
reproduced from:
General Electric's Incandescent Lamp Department's Guide to Floodlighting
by O.F. Haas and K.M. Reid
Cleveland
1931
Copyright 2001 VISUAL TERRAIN, INC.
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