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LAbbreviation of left, meaning stage left, and seen in stage directions, either alone or in combination with other abbreviations, as in DSL(down stage left). 
LADDERNon-climbable structure in the shape of a ladder from which instruments can be hung in a vertical "stack". 
LAMPGeneral term for unit of lighting equipment including spotlight, flood etc. 'Instrument' is more common in the U.S. (where 'lamp' often refers to what the uninitiated would call the 'bulb'), but both terms being replaced by the internationally recognized "luminaire".Lumiere
LAMPA light source, but sometimes used to refer specifically to the "bulb" in a stage lighting instrument. 
LASERAcronym (originally, LASER) for Light Amplification by Stimulated Emission of Radiation. A very high energy beam of light that remains virtually parallel throughout its length. Visible in the air only when a haze of smoke or dust is introduced. Great care is required when using lasers as this energy can cause permanent damage to the retina of the eye. 
LASHTo pull two flats together, edge to edge, by winding a lash line over lash line cleats in back.Lash line cleat
LASH CLEAT Last line cleat
LASH LINEA rope line used to fasten flats or other scenic units to one another.Lash line cleat
LASH LINE CLEATA small metal piece that can be screwed into the back of a flat frame, with a projecting tip over which a lash line can be slipped.Lash
LAUGH LINEA line of dialogue that is calculated to produce a laugh from the audience. 
LAVALIER MICROPHONEOriginally, a mic worn around the neck on a string. Now applies to a small "tieclip" microphone. 
LAY AN EGGSaid of a production or performance that fails miserably. Sometimes said of an actor whose jokes or funny business falls flat. 
LAY 'EM IN THE AISLESTo make an audience laugh hysterically. Thus, said of a show or performer who is successful in the effort to be funny. 
LC or L.C.Abbreviation of left center. 
L.D./LDLighting Designer 
LEADA principal role; also an actor who plays a principal role. 
LEADER TAPE(Now mostly obsolete) Non-magnetic plastic tape used to begin and end sound tapes and to separate cues on reel-to-reel tape. Clear leader tape is used to activate the automatic stop on some playback machines. Leader tape is available in a variety of colors. 
LEAKTo leak light; said when the crack between two flats lashed together lets light through, or when a lighting instrument's beam is not properly channeled by barn doors or top hat.Barn doors, top hat
LED (Light-Emitting Diode)A light-emitting diode (LED) offers many advantages over traditional light sources, including lower energy consumption, cool-runnin, longer lifetime, improved robustness, smaller size and faster switching.

Applications of LEDs are diverse. They are used as low-energy indicators but also for replacements for traditional light sources in general lighting and theatre lighting, although they are still more expensive than traditional "bulbs."
LEGITIMATE THEATREProfessionally produced stage plays as distinguished from films, variety shows, theme park performance. 

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