R Lamp
Reflector Lamp. Soft-glass reflectorized lamp with a generally smooth light distribution.
Rated Lamp Life
The point in hours where 50% of a lamp type initially started will still be functioning.
Recessed Fixture
A fixture mounted in the ceiling. With downlights, only the aperture and trim are visible from below. With fluorescent troffers and luminous ceilings, only the light shield is visible. Recessed fixtures provide direct downlighting and are highly effective used as wall washers, to accent painting, or to highlight architectural or home décor points of interest.
Recessed Lighting
Recessed Lighting is installed above the ceiling. Only the aperture or opening of the light shows. Recessed downlights are the most popular form of architectural lighting fixture because they blend into almost any décor and provide a range of lighting effects.
Reflector
A piece of material with a reflective surface that directs light in a desired direction. Reflectors are frequently specular, but may also be glossy, diffuse or matte.
Reflector Lamps
A light source of incandescent, compact fluorescent or HID source with a built in reflecting surface, usually a silver or aluminium coating on the bulb.
Relamping
A project where the existing lighting fixtures in a home or office setting are cleaned and new lamps installed.
Remote
Electronic control mounted separately from the master or individual dimmer, permitting operation from multiple locations. Full-function remotes set the dimming level, as well as switching on/off.
Retrofit
Upgrading a fixture, room or building by installing new lighting fixtures, parts or equipment.
Reverse Switch
On a ceiling fan, a switch that reverses the blade direction and airflow.
Riser
Raises a shade 1/2 inch to 2 inches for decorative appearance. Used instead of a layer harp.
Romex
A cable comprised of flexible plastic sheathing inside of which are two or more insulated wires for carrying electricity.
Rotary Dimmers
A dimming control that provides full-range, manual control of a light source. Some are equipped with a push-button operation that allows you to turn the light on and off and return to the previous lighting level.
Rough-In
Process of wiring a home and installing rough-in sections of the fixtures and the back boxes of electrical devices; precedes the finish work.
Rough Service Lamps
Incandescent lamps designed with extra filament supports to withstand bumps, shocks and vibrations.
Rust
Corrosion of metal, particularly iron and steel, from exposure to moist air and other elements; also called oxidation. Rust is a reddish-brown finish that can be produced by a paint or chemical process.
