1% (architectural dimming)
A system that has a lowest achievable light level of 1% of its maximum measured light output; 1% measured light is perceived as being dimmed to only 10%. Used in applications such as conference rooms, theaters, restaurants, and retail spaces.
5% (high performance dimming)
A system that has a lowest achievable light level of 5% of its maximum measured light output; 5% measured light is perceived as being dimmed to only 22%. Used in applications such as residences, lobbies, and small meeting rooms.
10% (lighting management dimming)
A system that has a lowest achievable light level of 10% of its maximum measured light output; 10% measured light is perceived as being dimmed to only 32%. Used in applications such as private and open offices, classrooms, stairwells, and restrooms.
The grouping of LEDs (from production) according to specifications, such as light output, color, and voltage so that LEDs of similar light performance are grouped.
Ratio of minimum to maximum measured light, usually expressed as a percentage.
Auxiliary device(s) needed to operate and vary the intensity of light output from LED lamp source(s) by regulating the voltage and current powering the source.
Parameters that define the operating power level output. The rating also includes both input and output specifications (voltage, current, frequency, etc.).
Noticeably unstable light output, usually involving large, quick changes in light intensity.
Lighting (usually white) that illuminates spaces or surfaces, as opposed to accent lighting or indicator lights.
The quantity of light, in candelas, emitted by a source in specific directions. Using these values, a diagram can be compiled that provides a direct impression of the light distribution from a lamp /luminaire combination.
LED (Light emitting diode)
A solid-state light source that uses multiple arrays of “white” or RGB (red/blue/green) light emitting diodes as a low wattage, low temperature source. LED arrays cannot operate without a driver, a fixture, and a control. These components must all be compatible in order to ensure that their integrity is maintained. It is an extremely long-lived light source, which also produces very little heat on the object being illuminated.
LED array (also called an LED light engine)
A device that incorporates LEDs into a package that may then be integrated into a fixture. It typically integrates multiple LEDs onto a PCB (printed circuit board) and may be replaceable.
Any device, which draws power from a power distribution system, such as a lighting fixture from a power circuit.
A unit of measurement of light energy. Specifically, lumens measure the amount of light an electric source (lamp) produces in all (360 degrees) directions (e.g. a candle gives off ~12 lumens, while a 100 W A19 incandescent lamp gives off ~1,650 lumens and a 4 ft 32 W T8 fluorescent lamp gives off ~3,100 lumens). The higher the number, the more light is emitted.“Lumens per watt (lm/W)” measures the efficiency of a light source.
The ratio of light emitted to the power required for a light source or luminaire (usually expressed in lumens per watt). Commonly used to measure energy efficiency, it is the lumens per watt from a light source (amount of light per watt of power).