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LIGHTING WITH [NCANDBSCBNT LAMPS 261
Low voltage types that can be operated from a storage battery are available making it possible to mount lamps on a moving vehicle.
MAZDA Lamps
Lamps for general lighting service have semi-concentrated filaments as compared to the highly concentrated sources of the modeling service lamps. They can be operated in almost any position, although their best performance is obtained when burned base-up.
The modeling lighting lamps are characterized by concentrated light sources. The monoplane filament construction possesses a number of advantages over other types, particularly freedom from color and greater uniformity in the illuminated field.
Equipment Maintenance
Dust or dirt on lamps and reflector surfaces greatly reduces their efficiency. Observation of many equipments employed for some time in studio service has shown an accumulation of dust and finger marks sufficient to reduce the light output 50 per cent. The lamps and lighting equipment should be cleaned periodically and reflecting surfaces kept in good condition. The 5 and 10 kilowatt lamps, which contain a scouring powder within the bulb to remove tungsten deposit, should be regularly cleaned by whirling the lamp. The cost of this maintenance is really an investment capable of big dividends, and its importance cannot be over-emphasized.
Correct Voltage Operation
Mention has previously been made of the excellent way in which the light spectral characteristics of the light of high wattage MAZDA lamps fits the color sensitivity of panchromatic film to produce correct rendering of colored properties. Operation of incandescent lamps at voltages below that marked on the lamp results in a very material reduction in the volume of light given out by the lamp, particularly the blue-violet components. Additional lamps and equipments are then needed and the reds, oranges and yellows are over-corrected. Likewise operation at voltages above normal tends towards over-emphasis of blues and violets. Cinematographers, interested in obtaining the highest quality in their work, should make certain that the lamps are operated at their label voltages. Voltage readings at the substation are insufficient; the supply voltage should be checked at the nearest centers of distribution.