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R
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.
RESISTIVE LOADS
Restive loads are lighting units that have no capacitive or inductive
components (No transformers, Starters or Ballasts) All mains filament lamps
are resistive loads e.g. Par56 .
REMOTE CONTROL
Used to activate a unit's features from a distance.
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.
RATED ACTIVE POWER
The input power measured (in watts) for a lamp-ballast combination.
REFERENCE BALLAST
A ballast that is specially constructed, having certain prescribed
characteristics and that is used for testing electric-discharge lamps and
other ballasts.
REFLECTED GLARE
Glare resulting from bright reflections from polished or glossy surfaces in
the field of view. Reflected glare usually is associated with reflections
from within a visual task or areas in close proximity to the region being
viewed.
REFRACTOR
A device that transmits and redirects the luminous flux from a source.
Refractors for outdoor luminairs are typically made from acrylic,
polycarbonate, or glass, and when well-designed, help control direct glare.
RELAY
A device that performs the actual on or off switching of an electrical load
due to small changes in current or voltages.
RESTRIKE TIME
Usually applied to HID light sources, the interval between the extinguishing
of an arc and the time it can be reignited.
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