Glossary

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A

Absolute Luminance Threshold

Abbe's Law

Absorption

Accent Lighting

Accent Luminaires

Action Spectrum

Adaptive Color Shift

Adaptive Lighting

Adaptive Subdivision

Adjustable Head

Aging

Allard's Law

Amalgam

American Lighting Association

Ambient Lighting

Annual Energy Savings

Annual Energy Use

Annual Lamp Replacement Costs

Annual Operating Cost (AOC)

Annual Operating Cost Savings

Area Lighting in Television, Film, and Theater

Aperture

Architectural Luminaire

Arc Discharge

Arc Lamp

Atmospheric Transmissivity

Average Luminance

Average Rated Lamp Life

Auxiliary Equipment for Discharge Lamps

B

Backlighting

Bactericidal Function

Bactericidal Lamp

Bactericidal Radiation

Baffle

Ballast Factor

Ballast-Lamp Photometric Factor

Bare Lamp

Barn Doors

Barrel

Base Light

Batten

Beam Angle

Beam Axis

Beam Efficiency

Beam Lumen

Beam Spread

Bi-Pin Base

Bin

Blending

Blinding Glare

Bollard

Borderline Between Comfort and Discomfort (BCD)

Bracket (Mast Arm)

Brightness (Bartley effect)

Brightness Contrast Threshold

Brightness Ratio

Broad

Broca-Sulzer Effect

Bug Rating

Bulb

C

Candela (CD)

Candlepower

Canopy

Carbon Arc

Carbon-Arc Lamp

Cave Effect

Ceiling Area Lighting

Ceiling Cavity

Ceiling Ratio

Center-Beam Candlepower (CBCP)

Chandelier

Channel

Characteristic Curve

Chroma

Chromatic Color

Chromatic Contrast Threshold

Chromaticity

Chromaticity Diagram

Chromaticity Difference Thresholds

Chromaticity Maintenance

Chromaticity Shift

Circline Lamp

Circuit Breaker

Code

Coefficient of Utilization (CU)

Coffer

Cold Cathode Fluorescent Lamp (CCFL)

Cold-Cathode Lamp

Color

Color Appearance Model

Color Comparison

Color Contrast Threshold

Color Correction

Color Difference Thresholds

Color Evaluation Sample

Color Fidelity

Color Fidelity Index

Color Frame

Color Matching

Color Media

Color Preference Index

Color Rendering

Color Rendering Index (CRI)

Color Space

Color Temperature

Color Tuning

Colorfulness

Compact Arc Lamp

Compact Fluorescent Lamp (CFL)

Compact Source Iodide (CSI) Lamp

Comparison Lamp

Complementary Wavelength

Complete Diffusion

Conical-Directional Reflectance

Conical-Directional Transmittance

Conical-Hemispherical Reflectance

Conical-Hemispherical Transmittance

Console

Conspicuity

Constant Current Transformers (CCT)

Continuous Dimming

Continuous Wave Lamp (CW)

Contour Light

Contrast

Contrast Rendition Factor (CRF)

Contrast Sensitivity

Contrast Threshold

Control Board

Cool White

Cornice Lighting

Correlated Color Temperature (CCT)

Counter-Key Light

Cove Base

Cove Lighting

Crest Factor

Criteria Rating

Cross Connect

Cross Fading

Cross-Lighting

Cucoloris

Cue

Cutoff Angle

Cutout

Cutter

D

Daylight

Daylight Conversion Filter

Daylight Factor

Daylight Harvesting

Daylight Lamp

DC

Densitometer

Designer Remote

Desk Lamp

Dichroic Filter

Diffuse Reflectance

Diffuse Reflection

Diffuse Transmission

Diffuse Transmittance

Diffused Light

Diffuser

Diffusing Panel

Diffusing Surface

Digital Multiplex (DMX)

DIM

Dim to Warm

Dimmable

Dimmer

Dimmer Board

Dimmer Curve

Dimmer per Circuit

Dimming

Dimming Power Reduction Factor

Direct Actinic Effect

Direct Component

Direct Glare

Direct Lighting

Direct Ratio

Direct-Indirect Lighting

Directed Light

Directional Lighting

Directional Luminaire

Double Broad

Downlight

Downward Component

Driver

Dust-Proof Luminaire

Dust-Tight Luminaire

E

Edge Lit LED

Efficacy

Efficiency

Electric Discharge

Electric-Discharge Lamp

Electrical and Electronics Engineers (IEEE)

Electrodeless Fluorescent Lamp

Electroluminescence

Electromagnetic Interference (EMI)

Electromagnetic Spectrum

Electronic Ballast

Electronic Transformer

Elevation

Ellipsoidal Reflector Lamps (ER Lamps)

Emergency Lighting

Emissivity

Emittance

Enclosed and Gasketed Luminaire

Energy

Energy Star

EPACT

Equal Interval (Isophase) Light

Equivalent Contrast

Equivalent Sphere Illuminance (ESI)

Equivalent Veiling Luminance

Excimer Lamp

Excitation Purity of Light

Exitance

Explosion-Proof Luminaire

Exposed Lamp

Exterior Lighting

Eyeball Luminaire

F

Facade Lighting

Fade

Fader

Far Field

FAY Light

Fenestra Method

Fenestration

Fidelity Index (Rf)

Field Angle

Field Efficiency

Field Lumen

Filament

Fill Light

Filter

Fitting

Fixed Light

Fixture

Flag

Flash Duration

Flash Frequency

Flash Interval

Flash Period

Flashing Light

Flashtube

Flat Panel Top LED

Flicker

Flicker Index

Flicker Photometer

Flood Lamp

Floodlight

Floodlighting

Floor Lamp

Floor Pocket

Fluorescence

Fluorescent Lamp

Fluorescent Tube

Flush Mount Lighting

Flush Mounted

Flux Transfer Theory

Focused Light

Foot-Candle (FC)

Footcandle

Footlambert

Forward Ray Tracing

Four-Way Switch

Fresnel Spotlight

Fringe Light

Front Lighting

Front of House Spots

Frosted Lens

Funnel

G

G-Lamp

Gamut Area

Gamut Area Index (GAI)

Gas-Filled Lamp

Gaseous Discharge

General Diffuse Lighting

General Illumination

General Lighting

General Lighting Source Lamp (GLS)

General Purpose Floodlight (GP)

Germicidal Action Spectrum

Germicidal Effectiveness

Germicidal Function

Germicidal Lamp

Germicidal Radiation

Glare

Global Solar Radiation

Globe

Globe Lamp

Globe Luminaire

Glow Discharge

Glow Factor

Glow Lamp

Goniophotometer

Grazing Light

Ground Light

Ground-Area Open Floodlight

Group Control

Group Flashing Light

H

Half Scrim

Halo Light

Halogen Incandescent Lamp

Halogen Infrared (HIR)

Halogen Lamp

Halophosphates

Hand Hole

Handheld Remote

Hard Light

Heat Extraction

Heat Sink

Heavy Duty Floodlight

Helmholtz-Kohlraush Effect

Hemispherical Reflectance

Hemispherical Transmittance

Hemispherical-Conical Reflectance (HCR)

Hemispherical-Conical Transmittance (HCT)

Hemispherical-Directional Reflectance (HDR)

Hemispherical-Directional Transmittance (HDT)

HID

High Hat

High Intensity Discharge (HID) Lamp

High Pressure Sodium (HPS) Lamp

High Voltage Lamp

High-Bay Lighting

High-Efficiency Plasma (HEP)

High-Hat Luminaire

High-Key

High-Mast

High-Output (HO) Lamp

High-Pressure Sodium (HPS)

Hollywood Lights

Hot Spot

Hot-Cathode Lamp

House Lights

Hue

Human Factor

Hybrid LED Luminaire

I

Ignitor

Illuminance

Illuminating Engineering Society of North America (IESNA)

Illumination

Incandescence

Incandescent Filament Lamp

Incandescent Lamp

Incentive

Incomplete Diffusion

Incremental Cost

Index of Illuminant Metamerism

Index of Observer Metamerism

Indirect Component

Indirect Lighting

Induction Lamp

Infrared Lamp

Infrared-Reflecting Lamp (IR-lamp)

Ingress Protection (IP) Rating

Initial Cost

Initial Lumens

Initial Luminous Exitance (ILE)

Input Power

Instant Start Ballasts

Instant Start Fluorescent Lamp

Insulated Ceiling (IC) Fixtures

Integrated Lighting Fixtures

Intensity

Interior Soffit Lighting

International Association of Lighting Designers (IALD)

International Dark-Sky Association (IDA)

Interval Timer

IR PAR-Lamp

Isocandela Line

J

K

Kelvin (K)

Key Light

Kicker

Kilowatt (KW)

Kilowatt-Hours (kWh)

Klieg Light

L

Laboratory Reference Standard

Lambertian Surface

Lamination

Lamp

Lamp Burnout Factor

Lamp Control

Lamp Life Multiplier

Lamp Lumen Depreciation (LLD)

Lamp Position Factor

Lamp Post

Lamp Shielding Angle

Lampholder

Layering Light

Leadership in Energy and Environmental Design (LEED)

LED (Light Emitting Diode) Control Circuitry

LED (Light Emitting Diode) Die

LED (Light Emitting Diode) Driver

LED Array

LED Lamp Integrated

LED Lamp Non-Integrated

LED Light Engine

LED Luminaire

LED Package

LED Power Source

LED Power Supply

Lens

Lensed Troffer

Level of Illumination

Light

Light Center

Light Center Length (LCL)

Light Emitting Diode (LED)

Light Lift

Light Loss Factor (LLF)

Light Output

Light Output Ratio (LOR)

Light Pollution

Light Scallops

Light Source

Light Source Color

Light Transformer

Light Trespass

Lighting Design

Lighting Effectiveness Factor (LEF)

Lighting Exterior Zones

Lighting Fixtures

Lighting Interior Zones

Lighting System

Lighting Technique

Lightness

Linear Fluorescent Lamp

Linear Lighting

Linear Polarization

LM-79

LM-80

Local Lighting

Localized General Lighting

Long-Arc Lamp

Low Pressure Mercury Lamp (LPML)

Low Pressure Sodium (LPS) Lamp

Low Voltage Fixtures

Low Voltage Lamp

Low Voltage Lamps

Low Voltage Track Lighting

Low-Pressure Mercury Germicidal Lamp

Low-Pressure Sodium (LPS)

Lumen (Lm)

Lumen Method

Lumen Second

Lumens to Watts

Luminaire

Luminaire Ambient Temperature Factor

Luminaire Dirt Depreciation (LDD)

Luminaire Efficiency

Luminaire Surface Depreciation Factor

Luminance

Luminance Coefficient (LC)

Luminance Contrast

Luminance Contrast Sensitivity

Luminance Difference

Luminance Difference Threshold

Luminance Factor

Luminance Ratio

Luminance Threshold

Luminescence

Luminous Ceiling

Luminous Efficacy

Luminous Energy

Luminous Exitance

Luminous Fluence

Luminous Fluence Rate

Luminous Flux

Luminous Flux Density at a Surface

Luminous Intensity

Luminous Range

Luminous Reflectance

Luminous Transmittance

LUX

Lux Meter

M

Magnesium Housing

Magnetic Ballast

Magnetic Base

Magnetic Bulb Holder

Magnetic Cord Holder

Magnetic Dimmer

Magnetic Fastening

Magnetic Holder

Magnetic Latch

Magnetic Levitation

Magnetic Mounting

Magnetic Remote Holder

Magnetic Sensor

Magnetic Switch

Magnetic Track Lighting

Magnetic Transformer

Magnification Level

Magnifier Lamp

Maintenance Factor (MF)

Maintenance Schedule

Maintenance-Free Lighting

Mantle

Manual Control

Manual Override

Manual Setting

Manual Switch

Marble Lamp

Marine Grade

Marine Lighting

Marine-Grade

Marking Light

Master

Matte

Matte Diffuser

Matte Finish

Matte Glass

Matte Paint

Matte Surface

Mean Horizontal Intensity

Mean Lumens

Mean Spherical Luminous Intensity (MSLI)

Mean Zonal Candlepower (MZCP)

Mechanical Dimmer

Median Life

Medium Base

Medium Screw Base

Mercury Fluorescent Lamp

Mercury Lamp

Mercury-Free Lighting

Mesh Diffuser

Mesh Shade

Metal Base

Metal Casting

Metal Core PCB

Metal Enclosure

Metal Finish

Metal Fixture

Metal Fluorescent Fixture

Metal Frame

Metal Grid

Metal Grill Shade

Metal Grille

Metal Halide (MH)

Metal Halide Lamp

Metal Hood

Metal Housing

Metal Inert Gas Welding (MIG)

Metal Lampshade

Metal Leaf Finish

Metal Mesh Shade

Metal Reflector

Metal Rim

Metal Shade

Metal Shade Pendant

Metal Spinning

Metal Tube

Metal Wall Sconce

Metal Wire

Metal Wire Holder

Metal-Halide Fixture

Metallic Coating

Metalwork

Metamerism

Metamers

Mica Shade

Micro Lens Array

Microcontroller

Microprism

Microprism Diffuser

Microwave Sensor

Mini Chandelier

Mini Pendant Light

Mini Socket

Miniature Bulb

Mirror Coating

Mirror Fixture

Mirror Optics

Mirror Wall Sconce

Misting System

Mobile Control

Mobile Light

Modeling Light

Modular Compact Fluorescent Lamp (MCFL)

Modular Compact Fluorescent Lamp (MCFL) Ballast

Modular Design

Modular Lighting

Modular Spotlight System

Modular System

Modular Track System

Mogul Base

Moisture Resistant

Molded Glass

Monochromatic Light

Monochromatic Light

Monorail

Mood Board

Mood Color Lighting

Mood Enhancing Colors

Mood Enhancing Illumination

Mood Lighting Control

Mood Lighting Effect

Mosaic

Mosaic Glass

Motion Activated Security Lights

Motion Detector

Motion Detector Factor

Motion Sensing Outdoor Lights

Motion-Triggered Lights

Motorized Mechanism

Motorized Tilt

Mottled Glass

Mounting Bolt

Mounting Box

Mounting Bracket

Mounting Height

Mounting Options

Mounting Plate

Mounting Screw

Mounting System

Movable Arm

MR Lamp

Mullion

Multi Fixture Chandelier

Multi Head Spotlight

Multi Lamp Fixtures

Multi Layered Lighting

Multi-Bulb Fixtures

Multi-Circuit Track

Multi-Color LED Lights

Multi-Directional

Multi-Function Lights

Multicolor Mode

Multicolored LED

Multidirectional Beam

Multifunctional Sensor

Multiple Beam Angle

Multiple Colors

Multiple Configurations

Multiple Level Switching

Multiple Light Sources

Multiple Modes

Mushroom Shade

Mylar Film

Mylar Reflector

N

Nadir Lighting

Nanometer (nm)

Narrow Angle Diffusion

Narrow Angle Luminaire

National Association of Innovative Lighting Distributors (NAILD)

National Electric Code (NEC)

National Electrical Manufacturers Association (NEMA)

National Institute of Standards and Technology (NIST)

Natural Daylighting

Natural Light

Natural Lighting

NEMA Enclosure Types

Neon

Neon Light

Niche Lighting

Night Light

Night-Sky Friendly

Nominal Voltage

Non-Dim Circuit

Non-Directional Light Source

Non-General Lighting Source Lamp

Non-Glare

Non-Lens Spotlight

Non-Uniform Illuminance

O

Occupancy Sensor

Organic Light-Emitting Diode (OLED)

Opal Glass

Opaque Material

P

Parabolic Aluminized Reflector (PAR)

Pendant Light

Photometry

Photopic Lumens

Post Light

Power Factor

Programmed Start Ballast

Pulse Start Ballast

Q

R

Radiation

Rated Lamp Life

Recessed Can Light Fixtures

Reflectance

Reflector

Restrike Time

Retrofit

Room Utilization Factor

S

Saturation

Sconce

Scotopic Lumens

Self-Ballasted Lamp

Semi Flush

Shade

Socket

Soffit Light Fixtures

Soft Light

Specular Reflection

Spotlight

Solid State Lighting (SSL)

Step Dimming

Strip Light

Swing Arm Lamp

T

Task Lighting

Torchiere

Track Lighting

Troffer

Twin Tube

U

U-Bend Lamp

UL Label (UL Listed)

Ultrasonic Sensors in Lighting Fixtures

Under Cabinet Lighting

Uplighting

V

Valance Lighting

Vandal-Resistant Lighting Fixtures

Vanity Light

Vapor-Tight Fixtures

Voltage

Volumetric Troffer

W

Wall Grazing

Wall Washing

Wallpack Light Fixtures

Warm White

Watt (W)

Watt to Lumen

Work Plane

X

Y

Z