Source : Webster's Revised Unabridged Dictionary (1913)

Footlight \Foot"light`\, n.
   One of a row of lights in the front of the stage in a
   theater, etc., and on a level therewith.

   {Before the footlights}, upon the stage; -- hence, in the
      capacity of an actor.

Source : WordNet®

footlight
     n : theater light at the front of a stage that illuminate the
         set and actors [syn: {footlights}]