ANSI – the American National Standards Institute, Inc. is the coordinator of including lighting standards on a national level.
ARC LAMP – a discharge lamp in which the light is emitted by an arc tube.
ARC TUBE – a tube made of clear quartz or ceramic material within a glass envelope of a HID lamp that contains the arc stream.
BALLAST – a device used to create a starting voltage and stabilize electrical current for fluorescent lamps and HID lamps.
BASE – the part of the lamp that connects to the socket.
BEAM CANDLEPOWER – measure of beam intensity reflected from a reflector lamp.
BEAM SPREAD – the angle of light distributed from a reflector lamp.
COLOR RENDERING INDEX (CRI) – a rating for fluorescent lamps to examine its variance from outdoor natural light, which has a defined CRI of 100. The rated ability of an artificial light source to render an object's true color.
FOOT CANDLE – a unit of illumination. Equivalent of one candle emitting light on one square foot of surface area from one foot away.
HALOGEN – a tungsten incandescent filament lamp with a quartz envelope containing a proportion of halogen insert gas.
KELVIN TEMPERATURE SCALE – a measurement of color appearance in degrees Kelvin (K).
KRYPTON – A heavier inert gas used in a variety of lamps to produce a brighter white light as well as longer lifetime by reducing the rate of filament decay.
LUMEN – a measure of luminous flux. The quantity of light emitted by an artificial light source.
MOL – Maximum Overall Length. Length from the tip of the glass envelope to end of the base.
NOMINAL LENGTH – overall length of a fluorescent lamp, including sockets. Generally, this measurement is from the back of one socket to the back of the opposing socket.
WATT – a unit of power consumption.
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