GLOSSARY
Acronyms, abbreviations, and technical terms used throughout this catalog are defined below. ACRONYMS AND ABBREVIATIONS
1x4 2x2 2x4
One foot by four feet in dimension (nominal) Two feet by two feet in dimension (nominal) Two feet by four feet in dimension (nominal) American National Standards Institute
LLLC lm/W
Luminaire-level lighting controls
Lumens per Watt
LPD MH
Lighting power density
ANSI CCT
Metal halide Mercury vapor
Correlated color temperature Compact fluorescent lamp
MV
CFL
NLC
Networked lighting controls Pulse-start metal halide Qualified products list Supplemental data sheet
CMH CRI DLC
Ceramic metal halide Color rendering index
PSMH
QPL SDS SSL
DesignLights Consortium®
HID
High-intensity discharge. Includes: HPS, MH, CMH, PSMH, and mercury vapor
Solid-state lighting
5/8" diameter tubular lamp 1" diameter tubular lamp 1½" diameter tubular lamp Technical Requirement Table
T5 T8
HO
High output
HPS
High-pressure sodium
T12 TRT
IESNA
Illuminating Engineering Society of North America
kW
Kilowatt(s)
W
Watt(s)
kWh LED
Kilowatt-hour(s)
Light emitting diode
GLOSSARY TERMS
Advanced Lighting Controls A combination of standard lighting control strategies, NLCs or LLLCs that adjust lighting systems to vary light level or turn on and off. Bi-Level Control Device that controls light source intensity at two discrete levels in addition to off. Bollards Lights mounted on short, heavy piers or posts. They are used mostly for larger residences and campus settings. Canopy Lighting Recessed or surface-mounted lighting on the underside of a covered drive through, covered walkway, or covered gasoline pumping station. Color Rendering Index (CRI) A rating index commonly used to represent how well a light source renders the colors of objects that it illuminates. The maximum value of 100 indicates that the colors of objects can be expected to be seen as they would appear under an incandescent or natural daylight. Sources with CRI values less than 50 are generally regarded as rendering colors poorly.
Continuous Dimming Control of a light source’s intensity to practically any value within a given operating range. Correlated Color Temperature (CCT) A measure of the color appearance of a light source relative to a black body at a particular temperature expressed in degrees Kelvin (K). Incandescent lights have a low color temperature (approximately 2700K) and have a red-yel- lowish tone; daylight has a high color temperature (approximately 5000K) and appears bluish (fluorescent Cool White is rated at 4100K). Daylight Sensor A device which senses the amount of daylight in a room and adjusts the electric lighting accordingly. DesignLights Consortium® (DLC) The DLC is an initiative of Efficiency Forward, Inc. As an independent non-profit organization, the DLC provides decision makers with data and resources on quality lighting, controls, and integrated building systems to reduce energy, carbon, and light pollution. Visit designlights.org
Diffuser Light control device that spreads light by scattering it. Dimmer Control that varies the output of the light source by reducing the voltage or current to the lamp. Downlights Light fixtures that direct all of the light in a downward direction. Most often are completely recessed into the ceiling, circular or square shaped, and less than 12” in diameter. Efficacy The amount of light produced per watt of electricity (lumens/watt). It is the rate at which a light source is able to convert electrical power (watts) into light (lumens), expressed in terms of lumens per watt (LPW). For example, a 10 watt lamp producing 800 lumens has an efficacy of 80 lumens per watt.
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