Definition of klieg light
: a carbon arc lamp used especially in making motion pictures
use in motion pictures
Engraving of Eadweard Muybridge lecturing at the Royal Society in London, using his Zoöpraxiscope to display the results of his experiment with the galloping horse, The Illustrated London News, 1889.
in motion-picture technology: Light sources
...came predominantly from the red end of the spectrum, to which the orthochromatic film of the era was relatively insensitive. After about 1912, white flame carbon arc instruments, such as the Klieg light (made by Kliegl Brothers and used for stage shows) were adapted for motion pictures. After the industry converted to sound in 1927, however, the sputtering ...
... THE KLIEG LIGHT
The pioneers discovered the theatrical industry (as well as aircraft searchlights) used carbon arc sources that not only gave out a lot of light, but were contained in fixtures that allowed, at least in their limited experience, more control of beam.
In addition, again from their limited viewpoint, they were "automatic" and "portable. ...