Definition of Terms Flashcards
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.
Amphere
What is ANSI?
American National Standards Institute
A tube enclosed by the outer glass envelope of a HID lamp and made of clear quartz or ceramic that contains the arc stream.
Arch Tube
What is ASHRAE?
American Society of Heating, Refrigerating and Air-Conditioning Engineers
A single opaque or translucent element used to control light distribution at certain angles
baffle
A device used to operate fluorescent and HID lamps. It provides the necessary starting voltage, while limiting and regulating the lamp current during operation
Ballast
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 Cycling
the ballast factor divided by the input power of the ballast.
BALLAST EFFICIENCY FACTOR
represents the percentage of the rated lamp lumens that will be produced by the combination
Ballast factor
Unit of luminous intensity, describing the intensity of a light source in a specific direction
Candela
curve, often on polar coordinates, illustrating the variation of luminous intensity of a lamp or luminaire in a plane through the light center
Candela Distribution
A measure of luminous intensity of a light source in a specific direction, measured in candelas
Candle Power
What is CBM?
Certified Ballast Manufacturers Association.
What us CEC?
California Energy Commission
The ratio of lumens from a luminaire received on the work plane to the lumens produced by the lamps alone.
Coefficient of Utilization