Crestron Lighting Design Guia de Instalação descarregar pdf (Página 72)

230 V Lighting Design Guide

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AMPERE: The standard unit of measurement for electric current that is equal to one coulomb per second. It deﬁnes

the quantity of electrons moving past a given point in a circuit during a speciﬁc period, abbreviated amp.

ANSI: Abbreviation for American National Standards Institute.

ARC TUBE: A tube enclosed by the outer glass envelope of an HID lamp and made of clear quartz or ceramic that

contains the arc stream.

ASHRAE: Abbreviation for the American Society of Heating, Refrigerating, and Air-Conditioning Engineers.

BAFFLE: A single opaque or translucent element used to control light distribution at certain angles.

BALLAST: A device used to operate ﬂuorescent and HID lamps. The ballast provides the necessary starting voltage,

while limiting and regulating the lamp current during operation.

BALLAST CYCLING: Undesirable condition under which the ballast turns lamps on and off (cycles) due to the

overheating of the thermal switch inside the ballast. This may be due to incorrect lamps, improper voltage being

supplied, high ambient temperature around the ﬁxture, or the early stage of ballast failure.

BALLAST EFFICIENCY FACTOR (BEF): The ballast efﬁciency factor is the ballast factor divided by the input power of

the ballast. The higher the BEF (within the same lamp-ballast type) the more efﬁcient the ballast.

BALLAST FACTOR (BF): The ballast factor for a speciﬁc lamp-ballast combination represents the percentage of the

rated lamp lumens produced by the combination.

CANDELA: Unit of luminous intensity, describing the intensity of a light source in a speciﬁc direction.

CANDELA DISTRIBUTION: A curve, often on polar coordinates, illustrating the variation of luminous intensity of a

lamp or luminaire in a plane through the light center.

CANDLEPOWER: A measure of luminous intensity of a light source in a speciﬁc direction, measured in candelas.

CBM: Abbreviation for Certiﬁed Ballast Manufacturers Association.

CEC: Abbreviation for California Energy Commission.

COEFFICIENT OF UTILIZATION (CU): The ratio of lumens from a luminaire received on the work plane to the lumens

produced by the lamps alone.

COLOR RENDERING INDEX (CRI): A scale of the effect of a light source on the color appearance of an object

compared to its color appearance under a reference light source. Expressed on a scale of 1 to 100, where 100

indicates no color shift. A low CRI rating suggests that the colors of objects appear unnatural under that particular

light source.

Appendix C: Glossary of Terms

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