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F
FLAGGING
When focussing lighting, flagging means waving your hand in and out of the
beam of a lantern/instrument in order to see where the beam is hitting on
stage. Flagging is particularly useful in high ambient light levels. (e.g.
"Can you flag that please ?") Term probably originates from a FRENCH FLAG.
FLASH BOX
A small box containing the socket into which a pyro cartridge is plugged.
Also known as a flash pod.
FLASH BUTTON
A push switch on a lighting desk which flashes selected channels / memories
/ submasters to full (100%) while pressed. Some Flash buttons on submasters
can be set to latch (ie they stay on when pushed, until they are pushed
again).
Sometimes known as a Bump Button.
FLASH OUT / THROUGH
Method of checking whether lanterns are functioning properly by flashing
them on one at a time. It is good practice to flash lanterns to 70%, rather
than Full to preserve lamp life.
FLIGHTCASE / FLIGHT CASE
Metal framed wooden box on wheels with a removable lid used for transporting
equipment between venues. Flightcases are very strong, and have reinforced
corners and edges. Care should be taken when lifting flightcases as they can
be very heavy.
FLOATS
Early form of footlights using burning wicks floating in oil across the
front of the stage. Now applies to anything rigged on the front edge of the
stage (eg Float microphones, Uplights / footlights etc.)
FLOOD
1) A lensless lantern that produces a broad non-variable spread of light.
Floods are used in battens, or singly to light cycloramas or large areas of
the stage.
2) To increase the beam angle of a Fresnel or PC by moving the lamp and
reflector towards the lens. "Flood that a bit, please!". The opposite
movement is called Spotting.
FLOORCANS
A PARCAN with an extra trunnion arm / yoke, and often a short nose, which is
designed to sit on the floor.
FLOORPOCKET / FLOOR POCKET
(US) A electrical socket mounted under a flap in the stage floor (UK
equivalent is DIP).
FLUORESCENCE
The property of some materials to glow when subjected to light. This
normally refers to ultraviolet light, although blue visible light (along
with many other colors) can cause fluorescence. The materials degrade the UV
wavelengths into longer and therefore visible reflected rays.
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