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230 V Lighting Design Guide

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LIGHT LOSS FACTOR (LLF): Factors that allow for a lighting system's operation at less than initial conditions. These

factors are used to calculate maintained light levels. LLFs are divided into two categories, recoverable and non-

recoverable. Examples are lamp lumen depreciation and luminaire surface depreciation.

LIFE-CYCLE COST: The total costs associated with purchasing, operating, and maintaining a system over the life of

that system.

LOUVER: Grid type of optical assembly used to control light distribution from a ﬁxture. Can range from small-cell

plastic to the large-cell anodized aluminum louvers used in parabolic ﬂuorescent ﬁxtures.

LOW POWER FACTOR: Essentially, an uncorrected ballast power factor of less than 0.9 (See NPF).

LOW-PRESSURE SODIUM: A low-pressure discharge lamp in which light is produced by radiation from sodium

vapor. Considered a monochromatic light source (most colors are rendered as gray).

LOW-VOLTAGE LAMP: A lamp (typically compact halogen) that provides both intensity and good color rendition.

Lamp operates at 12 V and requires the use of a transformer. Popular lamps are MR11, MR16, and PAR36.

LOW-VOLTAGE SWITCH: A relay (magnetically-operated switch) that allows local and remote control of lights,

including centralized time clock or computer control.

LUMEN: A unit of light ﬂow, or luminous ﬂux. The lumen rating of a lamp is a measure of the total light output of the

lamp.

LUMINAIRE: A complete lighting unit consisting of a lamp or lamps, along with the parts designed to distribute the

light, hold the lamps, and connect the lamps to a power source. Also called a ﬁxture.

LUMINAIRE EFFICIENCY: The ratio of total lumen output of a luminaire and the lumen output of the lamps, expressed

as a percentage. For example, if two luminaires use the same lamps, more light is emitted from the ﬁxture with the

higher efﬁciency.

LUMINANCE: A photometric term that quantiﬁes brightness of a light source or of an illuminated surface that

reﬂects light. It is expressed as footlamberts (English units) or candelas per square meter (Metric units).

LUX (LX): The metric unit of measure for illuminance of a surface. One lux is equal to one lumen per square meter.

One lux equals 0.093 footcandles.

MAINTAINED ILLUMINANCE: Refers to light levels of a space at other than initial or rated conditions. This term

considers light loss factors such as lamp lumen depreciation, luminaire dirt depreciation, and room surface dirt

depreciation.

MERCURY VAPOR LAMP: A type of high intensity discharge (HID) lamp in which most of the light is produced by

radiation from mercury vapor. Emits a blue-green cast of light. Available in clear and phosphor-coated lamps.

METAL HALIDE: A type of high intensity discharge (HID) lamp in which most of the light is produced by radiation of

metal halide and mercury vapors in the arc tube. Available in clear and phosphor-coated lamps.

MR-16: A low-voltage quartz reﬂector lamp, only 2 inch diameter. Typically the lamp and reﬂector are one unit,

which directs a sharp, precise beam of light.

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Crestron Lighting Design Guía de instalación Pagina 76