A2LA: American Association for Laboratory Accreditation.
ALA: American Lighting Association.
ANSI: American National Standards Institute.
ASSIST: Alliance for Solid State Illumination Systems and Technologies.
ASTM: American Society for Testing of Materials.
Automatic daylight shutoff: A photocell device that automatically prevents operation of a luminaire during
daylight hours.
Portable luminaire: A luminaire whose power supply connection is made by means of a cord with or
without a plug.
Power factor: The active power divided by the apparent power (i.e., product of the rms input voltage and
rms input current of a driver).
EE. Residential luminaire: A luminaire using a Class B power supply.
FF. UL: Underwriters Laboratories
Color rendition: The effect the spectral characteristic of the light emitted by the LED has on the color
appearance of the objects illuminated by it is called color rendition. The color rendering index (CRI) is
defined in terms of a comparison of the spectral tri-stimulus values of the objects under test illumination and
standard illumination according to the recommendations of CIE Publication No.13.3-1995.
IEC: International Electrotechnical Commission.
IESNA: Illuminating Engineering Society of North America.
Initial performance values: The photometric and electrical characteristics at the end of the 100-hour aging
period in a 25°C test environment.
LED array: An assembly of LED packages on a printed circuit board or substrate, possibly with optical
elements and additional thermal, mechanical, and electrical interfaces. The device does not contain a
power source and is not connected directly to the branch circuit.
LED driver: A power source with integral LED control circuitry designed to meet the specific requirements
of a LED lamp or a LED array.
LED lumen depreciation (L70): The length of time declared by the manufacturer at which 70% lumen
maintenance of any large sample of LEDs is reached.
LED luminaire: A complete LED lighting unit consisting of a light source and driver together with parts to
distribute light, to position and protect the light source, and to connect the light source to a branch circuit.
The light source itself may be an LED array, an LED module, or an LED lamp. The LED luminaire is
intended to connect directly to a branch circuit.
LED module: A component part of an LED light source that includes one or more LEDs that are connected
to the load side of LED power source or LED driver. Electrical, electronic, optical, and mechanical
components may also be part of an LED module. The LED module does not contain a power source.
LED package: An assembly of one or more LED die that contains wire bond connections, possibly with an
optical element and thermal, mechanical, and electrical interfaces. The device does not include a power
source and is not connected directly to the branch circuit.
Luminaire efficacy: The luminous flux of the luminaire divided by the input power.
Lumen maintenance: The luminous flux at a given time in the life of the LED and expressed as a
percentage of the initial luminous flux.
MacAdam color ellipse: An elliptical region of chromaticity coordinates that is defined using a centroid, a
tilt angle relative to a horizontal axis, and a defined level of variance. Such a region defines what
chromaticity coordinates can be acceptably associated with a target Correlated Color Temperature. For
these criteria, standardized color ellipses are defined using centroids based upon objective chromaticities
(x,y) and tilt angles (è) specified in Table 1 and 2 of ANSI C78.376-2004, and a defined variance of four
steps.
Commercial luminaire: A luminaire using a Class A power supply.
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