Abstract :
Theatres differ one from another not only in size but in their form and in the way in which they are used, but there is an essential similarity in all stage-lighting installations. They have to provide illumination as well as lighting for dramatic effect - logic versus artistic expression. All, therefore, require equipment to localise light in various areas of the stage, and all require a centralised dimmer regulator to enable an operator to ´paint the stage´ with changes of light.
