Focus Earth Glossary

A comprehensive collection of key terms and definitions you need to know

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Accessories
Any additional luminaire component that can be added (shield, bracket, shades, wiring, etc.)
Luminaire Components
Lighting Supply and Illumination Industry
Wattage (W)
Measure of electrical power consumed by a light source. It represents the energy used by the bulb.
Basic Lighting Terms
Lighting Supply and Illumination Industry
Luminous Efficacy (lm/W)
Ratio of luminous flux to electrical power. Higher efficacy means more light output per watt.
Basic Lighting Terms
Lighting Supply and Illumination Industry
Luminous Flux
Total quantity of light emitted by a source, measured in lumens (lm).
Basic Lighting Terms
Lighting Supply and Illumination Industry
Candela (cd)
Unit of luminous intensity, measuring the intensity of light emitted in a specific direction.
Basic Lighting Terms
Lighting Supply and Illumination Industry
Color Rendering Index (CRI)
Scale (0-100) that measures how accurately a light source displays colors in comparison to natural daylight.
Basic Lighting Terms
Lighting Supply and Illumination Industry
Correlated Color Temperature (CCT)
Color appearance of light, measured in Kelvin (K), ranging from warm (below 3,000 K) to cool (above 5,000 K).
Basic Lighting Terms
Lighting Supply and Illumination Industry
Department of Energy (US)
https://www.energy.gov/
Organizations
Organizations
Beam Angle
Angle at which light is emitted from a lamp or fixture, affecting how spread out or focused the light is.
Basic Lighting Terms
Lighting Supply and Illumination Industry
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Lighting Supply and Illumination Industry

Luminaire Components

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

Lighting Supply and Illumination Industry

Luminaire Components

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

Basic Lighting Terms

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

Traditional Lamps and Fixtures

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

Lighting Design and Applications

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

Property Valuation

General

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

Types of Valuation

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

Income-Producing Property

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

Financial and Investment

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

Property Types and Classifications

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

Organizations

Organizations

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)

LED Types

LED Types

Fixture
Housing portion of the luminaire, connecting a light to the infrastructure (ceiling, wall, pole, etc.)
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