CARBON ARC [FILM TECHNOLOGY]

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Carbon arc 

[Film Technology]  

A luminant created by a gaseous discharge between two cerium-cored carbon rods. These carbon trims burn for a limited duration (e.g. 45 to  90 minutes) where arc lamp produce high intensity light of excellent colour quality and sharpness, they require skilled operation and maintenance to achieve these properties, and to sustain an even, constant light out-put. Mainly used as high intensity light sources for large-area or exterior lighting. Available in 225 amp (brute) down to smaller fresnel spot and follow spotlight versions (65amp) 6000/335 0k, 1/2-1 hour burning time. Carbon arcs are low voltage, high current sources developed in motion picture studios to provide high intensity light of excellent colour quality. The arc being a very concentrated point source, produce very sharp, crisp illumination with enhanced modeling lighting, texture, textural lighting and shadow formation ; with the advent of other powerful, more compact, and less demanding light sources, the use of carbon arcs has lasted in both film studio and  television studios. Arc lamps require a DC supply (usually 115v). The gaseous arc itself is drawn between two cerium-cored white-flame carbon rods or trims. These continually burn away, the motor driven feed rotating the positive pole to sustain a symmetrical crater. Burning life is limited to about 90 minutes, plus the need for cool-down time before redimming. Carbon trims burn at colour temperatures from around 6000-3350 K, depending on their core material; corrective colour filters being used to adjust or match their light as required. A luminent created by a gaseous discharge between two cerium-cored carbon rods. The trims [Carbon trims]burn for a limited duration  ( e.g. 45 to 90 minuets) while arc lamps produce high intensity light of excellent colour quality and sharpness, they require skilled operation and maintenance to achieve these properties, and to sustain an even, constant light out-put.

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