A comprehensive collection of key terms and definitions you need to know
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Track Lighting
System of mounted lights along a track, allowing flexibility in positioning and direction of the lights.
Lighting Design and Applications
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
Lux (lx)
Unit of illumination, equal to one lumen per square meter. It measures the amount of light that falls on a surface.
Basic Lighting Terms
Lighting Supply and Illumination Industry
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
Light Distribution
Refers to how light is spread across an area, including direct, diffuse, or mixed types of distribution.
Basic Lighting Terms
Lighting Supply and Illumination Industry
Illuminance
Total amount of visible light illuminating a point on a surface from all directions above the surface
Basic Lighting Terms
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
Vertical Illuminance
Measure of brightness from a light source which is taken through a light meters sensor at a vertical position on a vertical surface
Basic Lighting Terms
Lighting Supply and Illumination Industry
Uniformity Ratio
Describes the uniformity of light levels across an area. May be expressed as a ratio of average to minimum or maximum to minimum level of illumination for a given area. Lowest level of illumination should be no less than 1/4 the maximum level of illumination (4:1)
