Crestron Lighting Design Guía de instalación descargar pdf (Pagina 79)

230 V Lighting Design Guide

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T12 LAMP: Industry standard for a ﬂuorescent lamp that is 12 1/8 inch (1 inch, 2.55 cm) in diameter. Other sizes

are T10 and T8 lamps.

TANDEM WIRING: A wiring option in which a ballast is shared by two or more luminaires. This reduces labor,

materials, and energy costs. Also called master-slave wiring.

THERMAL FACTOR: A factor used in lighting calculations that compensates for the change in light output of a

ﬂuorescent lamp due to a change in bulb wall temperature. It is applied when the lamp/ballast combination under

consideration is different from that used in the photometric tests.

TRIGGER START: Type of ballast commonly used with 15 watts and 20 watts straight ﬂuorescent lamps.

TROFFER: The term used to refer to a recessed ﬂuorescent light ﬁxture (combination of trough and coffer).

TUNGSTEN HALOGEN LAMP: A gas-ﬁlled tungsten ﬁlament incandescent lamp with a lamp envelope made of

quartz to withstand the high temperature. This lamp contains some halogens (namely iodine, chlorine, bromine, and

ﬂuorine), which slow the evaporation of the tungsten. Also, commonly called a quartz lamp.

ULTRA VIOLET (UV): Invisible radiation that is shorter in wavelength and higher in frequency than visible violet light

(literally beyond the violet light).

UNDERWRITERS' LABORATORIES (UL): An independent organization whose responsibilities include rigorous testing

of electrical products. When products pass these tests, they can be labeled (and advertised) as UL listed. UL tests

for product safety only.

VANDAL-RESISTANT: Fixtures with rugged housings, break-resistant type shielding, and tamper-proof screws.

VCP: Abbreviation for visual comfort probability. VCP is a rating system for evaluating direct discomfort glare. This

method is a subjective evaluation of visual comfort expressed as the percent of occupants of a space bothered by

direct glare. VCP allows for several factors: luminaire luminances at different angles of view, luminaire size, room

size, luminaire mounting height, illuminance, and room surface reﬂectivity. VCP tables are often provided as part of

photometric reports.

VERY HIGH OUTPUT (VHO): A ﬂuorescent lamp that operates at a very high current (1500 mA), producing more light

output than a high output lamp (800 mA) or standard output lamp (430 mA).

VOLT: The standard unit of measurement for electrical potential. It deﬁnes the electromotive force of electricity.

VOLTAGE: The difference in electrical potential between two points of an electrical circuit.

WALLWASHER: Describes luminaires that illuminate vertical surfaces.

WATT: The unit for measuring electrical power. It deﬁnes the rate of energy consumption by an electrical device

when it is in operation. The energy cost of operating an electrical device is calculated as its wattage times the

hours of use. In single-phase circuits, it is related to volts and amps by the formula: volts x amps x PF = watts.

NOTE: For ac circuits, PF must be included.

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Crestron Lighting Design Guía de instalación Pagina 79