Crestron Lighting Design Guía de instalación descargar pdf (Pagina 78)

230 V Lighting Design Guide

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RADIO FREQUENCY INTERFERENCE (RFI): Interference to the radio frequency band caused by other high frequency

equipment or devices in the immediate area. Fluorescent lighting systems generate RFI.

RAPID START (RS): The most popular ﬂuorescent lamp/ballast combination used today. This ballast quickly and

efﬁciently preheats lamp cathodes to start the lamp. Uses a bi-pin base.

ROOM CAVITY RATIO (RCR): A ratio of room dimensions used to quantify how light interacts with room surfaces.

A factor used in illuminance calculations.

REFLECTANCE: The ratio of light reﬂected from a surface to the light incident on the surface. Reﬂectances are often

used for lighting calculations. The reﬂectance of a dark carpet is around 20%, and a clean white wall is roughly

50% to 60%.

REFLECTOR: The part of a light ﬁxture that shrouds the lamps and redirects some light emitted from the lamp.

REFRACTOR: A device used to redirect the light output from a source, primarily by bending the waves of light.

RECESSED: The term used to describe the doorframe of a troffer where the lens or louver lies above the surface of

the ceiling.

REGULATION: The ability of a ballast to hold constant (or nearly constant) the output watts (light output) during

ﬂuctuations in the voltage feeding of the ballast. Normally speciﬁed as +/- percent change in output compared to

+/- percent change in input.

RELAY: A device that switches an electrical load on or off based on small changes in current or voltage. Examples

include low voltage relay and solid state relay.

RETROFIT: Refers to upgrading a ﬁxture, room, or building by installing new parts or equipment.

SELF-LUMINOUS EXIT SIGN: An illumination technology using phosphor-coated glass tubes ﬁlled with radioactive

tritium gas. The exit sign uses no electricity and thus does not need to be hardwired.

SEMI-SPECULAR: Term describing the light reﬂection characteristics of a material. Some light is reﬂected

directionally, with some amount of scatter.

SHIELDING ANGLE: The angle measured from the ceiling plane to the line of sight where the bare lamp in a

luminaire becomes visible. Higher shielding angles reduce direct glare. It is the complementary angle of the cutoff

angle. (See CUTOFF ANGLE).

SPACING CRITERION: A maximum distance that interior ﬁxtures may be spaced that ensures uniform illumination on

the work plane. The luminaire height above the work plane multiplied by the spacing criterion equals the center-to-

center luminaire spacing.

SPECULAR: Mirrored or polished surface. The angle of reﬂection is equal to the angle of incidence. This word

describes the ﬁnish of the material used in some louvers and reﬂectors.

STARTER: A device used with a ballast to start (preheat) ﬂuorescent lamps.

STROBOSCOPIC EFFECT: Condition where rotating machinery or other rapidly moving objects appear to be standing

still due to the alternating current supplied to light sources. Sometimes called strobe effect.

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Crestron Lighting Design Guía de instalación Pagina 78