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THESE PHOTOGRAPHS REFLECT OUR INTEREST IN LIGHT CONTROL
1. A polished metal or mirrored glass surface gives accurate light control
.TTlLTHOUGH an incandescent lamp can be used bare for photograph)-, its light is made infinitely more effective by properly designed reflectors.
As these photographs suggest, the nature of reflecting surfaces plays an important part in determining the light control provided by reflectors. Notice what happens, as illustrated in photograph No. 1, when light strikes a polished metal or mirrored glass reflector. Such a surface provides most accurate control of light as it reflects the light in a definite direction. On the other hand, a surface that is practically matte, such as porcelain enamel, as photograph No. 2 shows, diffuses the light in all directions and permits little control. While, as photograph No. 3 shows, a semimatte surface, such as treated aluminum, gives a spread of light, in a definite direction with controlled diffusion.
These facts about light control, fundamental in illumination and in cinematography, have been keenly studied by General Electric's engineers and scientists. Along with a basic knowledge of how to produce the lighting effects cinematographers use so successfully, these facts aid in developing new Edison Mazda lamps to meet motion picture requirements. They also guide us in improving existing types of Edison Mazda lamps and in helping you obtain full effectiveness from these lamps.
Coupled with the hundreds of tests, checks and inspections which Edison Mazda lamps undergo, this study provides another reason why studios from coast to coast use Edison Mazda lamps for every lighting need — from set lighting to process work. General Electric Company, Nela Park, Cleveland, Ohio.
EDISON MAZDA LAMPS
GENERAL H ELECTRIC
2 . A matte surface permits little light control
3. A semi-matte surface gives controlled diffusion, plus direction
1,500 and 1,000-watt PS-52.
Used in rifle lamps, side
lamps and strip units. Also
for floodlightint.
General Electric invites you to visit its exhibit in the Electrical Building at the Century of Progress,