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L
LADDER
Non-climbable structure in the shape of a ladder from which lanterns can be
hung in a vertical "stack".
LAMP
A light bulb is used in domestic situations (i.e. in the home). In the
industry, we only use LAMPS. As the saying goes, "Bulbs is what you put in
the ground". Example usage: "The lamp in the DSC fresnel has blown". In the
TV/Film world, a lamp is called a BUBBLE.
LAMP TRAY
Lower section of the body of a theater lantern on which the lamp holder is
mounted. Some lamp trays are hinged, some are removable from the rest of the
body. Modern safety legislation (UK) requires that the lamp tray cannot be
opened until power is disconnected.
LAMPY
Theater / Rock & Roll lighting technician. Distinct from a "Techie" who may
also be a carpenter or stage crew member. A lampy only concerns him/herself
with lighting.
LANTERN
1) General term for unit of lighting equipment including spotlight, flood
etc. Term now being replaced by the internationally recognized "luminair"
(esp. Europe) or "instrument" in the US.. 2) Glazed section of roof usually
in haystack form over the fly tower that automatically opens in the case of
fire. An updraught is created which inhibits fire from spreading quickly
into the auditorium, and prevents build-up of smoke at stage level.
LASER
Acronym of 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.
LASER LIGHT
A light that emits a highly controlled narrow beam of light.
LATCH PAD OR BUTTON
Switches a channel on or off with a touch on, touch off action.
LATEST TAKES PRECEDENCE
Abbreviated to LTP, this is a standard by which some lighting desks operate.
If there is more than one control on the desk affecting a particular
channel, then the latest control to operate will be the one to affect the
output on stage. This system is used on desks with moving light
functionality.
LCL
Abbreviation for Light Center Length. This measurement (in mm) is the
distance between the top of the lamp base and the optical center of the
filament. This measurement is critical as it ensures that for a particular
lantern, the filament is at exactly the correct position for maximum light
output and efficiency. Many different lamp types exist, but there are far
fewer lamp-base types, meaning it's possible to insert the wrong lamp into a
lantern very easily, resulting in poor output and efficiency.
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