Instrument
An Instrument is a theater and film lighting term for any individual lighting fixture — a spotlight, fresnel, LED panel, or other light source used to illuminate a scene or performer.
Gels
Gels are thin colored or diffusion sheets placed in front of lighting instruments to modify their color, quality, or intensity — a fundamental tool in film and theater lighting design.
Light Board
A Light Board is the electronic control console used to program and execute all lighting cues in theatrical and television productions — controlling hundreds of instruments simultaneously.
Light Cues
Light Cues are pre-programmed lighting changes that occur at specific moments during a theatrical performance — transitions between lighting states called by the stage manager and executed by the board operator.