Focus Earth Glossary

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

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Footcandle (fc)
Unit of illumination, equal to one lumen per square foot, commonly used in the U.S.
Basic Lighting Terms
Lighting Supply and Illumination Industry
Glare
Excessive brightness causing discomfort or visual impairment. Often minimized with diffusers or shields.
Basic Lighting Terms
Lighting Supply and Illumination Industry
Global Lighting Association
https://globallightingassociation.org/
Organizations
Organizations
Gross Income Multiplier (GIM)
Valuation tool used for income-producing properties, calculated by dividing the property price by its gross rental income.
Income-Producing Property
Property Valuation
Gross Rental Income
Total income from renting out a property before any expenses are deducted.
Income-Producing Property
Property Valuation
Halogen Bulb
Type of incandescent lamp that uses a halogen gas to increase brightness and lifespan.
Traditional Lamps and Fixtures
Lighting Supply and Illumination Industry
Hertz (Hz)
Unit for measuring frequency of oscillations when referring to electromagnetic waves. Measured as 1Hz = 1cycle/second
Basic Lighting Terms
Lighting Supply and Illumination Industry
High-Intensity Discharge (HID) Lamp
Category of lights including metal halide (MH), high-pressure sodium (HPS), and mercury vapor lamps, known for their high brightness and used for street and industrial lighting.
Traditional Lamps and Fixtures
Lighting Supply and Illumination Industry
Horizontal Illuminance
Measure of brightness from a light source which is taken through a light meters sensor at a horizontal position on a horizontal surface
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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