Crestron Lighting Design Guía de instalación descargar pdf (Pagina 75)

230 V Lighting Design Guide

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HID: Abbreviation for high intensity discharge. Generic term describing mercury vapor, metal halide, high-pressure

sodium, and (informally) low-pressure sodium light sources and luminaires.

HIGH BAY: Pertains to the type of lighting in an industrial application where the ceiling is 20 feet or higher. Also

describes the application itself.

HIGH OUTPUT (HO): A lamp or ballast designed to operate at higher currents (800 mA) and produce more light.

HIGH POWER FACTOR: Ballast with a 0.9 or higher rated power factor, which is achieved by using a capacitor.

HIGH PRESSURE SODIUM LAMP: A high intensity discharge (HID) lamp whose light is produced by radiation from

sodium vapor (and mercury).

HOT RESTART or HOT RESTRIKE: The phenomenon of re-striking the arc in an HID light source after a momentary

power loss. Hot restart occurs when the arc tube has cooled a sufﬁcient amount.

IESNA: Abbreviation for Illuminating Engineering Society of North America.

ILLUMINANCE: A photometric term that quantiﬁes light incident on a surface or plane. Illuminance is commonly

called light level. It is expressed as lumens per square foot (footcandles), or lumens per square meter (lux).

INDIRECT GLARE: Glare produced from a reﬂective surface.

INSTANT START: A ﬂuorescent circuit that ignites the lamp instantly with a very high starting voltage from the

ballast. Instant start lamps have single-pin bases.

KEY LIGHT: When a light is shined on an object from a single point source of light it is called key light. It highlights

contours on the object and creates shadows. The exact effect depends on the angle of the beam of light. The light

source may be best placed in front of and to the side of the object at an angle.

NOTE: For ac circuits, PF must be included.

LAMP CURRENT CREST FACTOR (LCCF): The peak lamp current divided by the RMS (average) lamp current. Lamp

manufacturers require <1.7 for best lamp life. An LCCF of 1.414 is a perfect sine wave.

LAMP LUMEN DEPRECIATION FACTOR (LLD): A factor that represents the reduction of lumen output over time. The

factor is commonly used as a multiplier to the initial lumen rating in illumination calculations, which compensates

for the lumen depreciation. The LLD factor is a dimensionless value between 0 and 1.

LAY-IN-TROFFER: A ﬂuorescent ﬁxture. Usually a 2 ft x 4 ft ﬁxture that sets or lays into a speciﬁc ceiling grid.

LED: Abbreviation for light emitting diode. An illumination technology used for exit signs. Consumes low wattage

and has a rated life of greater than 80 years.

LENS: Transparent or translucent medium that alters the directional characteristics of light passing through it.

Usually made of glass or acrylic.

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Crestron Lighting Design Guía de instalación Pagina 75