Abstract
Xenon bulbs provide a new light source for motion picture projectors. These devices are sealed arc lamps which eliminate the intense heat and combustion products common to conventional carbon arc light sources. The ultraviolet component of the xenon light source ionizes the oxygen of the air and produces ozone. A projector operator must remain in the small, confined booth during all periods of operation. A thorough study of ozone levels in a booth has been made. The atmospheric concentration of ozone during the showing of films ranges from less than 0.01 ppm to 0.7 ppm. The conditions which produce the various levels were determined and evaluated. Effective control methods were developed.