K is for Kill, not as ominous as it sounds, and very little else so we will include L as well to make it worthwhile.

Kelvin: A measure of light color temperature, abbreviated "K".

Key Light: The main or dominant source of light focused on a performer or object on stage.

Kicker: A secondary side-light or back-light used to accent areas

Kill: An instruction given by the stage manager or director to stop an action, turn off a light, or cut a sound effect immediately.

Well we said there weren’t many K’s so here goes with L which is for Lamps, Legs and Lines so read on for more -

Lamps: the item that creates light in a lantern - “bulb” as we know it

Lantern: – stage light case that holds the lamps

Leading lady/man /actor:  person who plays the main part in a film, play, etc

Lectern:  upright desk or stand, usually with a slanted top, to hold text or music when someone is speaking 

Leg: vertical curtains (drapes) hung at the sides of the stage to mask views of side off stage

Lens: Optical glass used to direct light by concentrating or dispersing light beams. Usually has one or both sides curved

Level: intensity of sound or light.

Libretto: both the spoken dialogue and the song lyrics of a musical, opera or operetta.  (Italian for 'little book', from the small booklets sold to opera audiences).

Librettist: one who writes Librettos

Licence:  the document required that grants permission to produce a play or musical after paying a royalty to the author and/or licenser

Lighting designer:  the person responsible for the look of a production's lighting: how the stage is lit and any lighting effects

Lighting Plot: detailed, architectural-style blueprint or map used by lighting designers to show where lighting fixtures go, how they are focused, and how they connect in a venue

 Limes: an old term for Follow Spots

 Lines: the words of a particular role

 Loading Dock: large entrance from outside the theatre for loading and unloading scenery, equipment etc – often very tall to allow easy access of scenery flats.

 LX: short for Electrics – person(s) responsible for the stage lighting for a production

 Lyrics: the words for a song or songs

 Lyricist: the writer responsible for the lyrics of a show as apposed to the music or lines