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R
R & V
Reiche & Vogel. German manufacturers of low voltage beamlight. Now ometimes
used to describe any beamlight.
R LAMP
A common reflector lamp. An incandescent filament or electric discharge lamp in which the sides of the outer blown-glass bulb are coated with a reflecting material so as to direct the light. The light-transmitting region may be clear, frosted, or patterned.
RADIO CONTROL
System whereby battery-powered practicals / props on stage can be controllable from offstage with no connecting leads.
RAM
A memory that will lose its contents when power is turned off. It is usually used for short term storage when a unit is running. Ram can be Backed Up with a battery so that it will not lose its data when the main power is removed.
RAT STAND
Illuminated music stand.
RATED ACTIVE POWER
The input power measured (in watts) for a lamp-ballast combination.
RCD
Residual Current Device. Protects the user against short circuit (earth faults) and earth leakage caused by damaged cable or faulty equipment. A RCBO is a combined MCB and RCD, protecting against earth leakage/short circuit and overload. Known as a GFI (Ground Fault Interruptor) in the USA.
RDM
Remote Device Management. New lighting control protocol (officially ANSI E1.20 standard) currently under development at ESTA, which allows two-way communication over standard DMX512 cable.
REDHEAD
800W open-faced adjustable flood lamp used in film / TV lighting. So-called because of it's red paint finish.
REFERENCE BALLAST
A ballast that is specially constructed, having certain prescribed characteristics and that is used for testing electric-discharge lamps and other ballasts.
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