THE MEASUREMENT OF INTENSIETY OF SAFETY LIGHT LAMP

Abstract

There have been few reports on the measurement of the safe light lamp in a dark room. Therefore, the author made a few experiments to study this measurement. It was concluded that the intensity of the safe lamp in a room 3.3 m in area, was about 11.5 lux. Other experiments with films were conducted to determine the relation of film and developer to fog, and a simple method was worked out to change the intensity of a safety lamp.