Electrical Control for Varying Lighting Intensities

Intensity control through new developments in apparatus is now available in economic forms and makes possible a variety of distributions suitable for producing visibility, comfort, and composition for different purposes.

The primary aspect of this research deals with the levels of illumination desirable for various purposes. The tendency is in the direction of high intensities and the consequent increase in the cost of current. This paper investigates the available apparatus for the control of intensity electrically, not only from the standpoint of economy, but also for promoting comfort in seeing and flexibility in design.