Luminance

Luminance is a measure of the brightness of a surface that is illuminated by a light source. It is the amount of light that is emitted, reflected or transmitted by a surface per unit area, in a given direction. Luminance is typically measured in candelas per square meter (cd/m²) and is an important parameter for assessing the visibility and quality of images and displays.

L=I/A 

A = Illuminated surface (m²)

I = Luminous intensity

L = Luminance

Luminance is influenced by a variety of factors, including the intensity and color of the light source, the reflectivity of the surface, and the angle at which the surface is viewed. For example, a surface that reflects more light will have a higher luminance than a surface that reflects less light. Similarly, a surface that is viewed from an oblique angle will appear less bright than when viewed from directly in front of it.

Luminance is used in many applications, including the design of displays, computer graphics, and video production. It is also an important parameter for assessing the safety of roadways and outdoor lighting, as high luminance levels can cause glare and reduce visibility.

Luminous flux

Luminous  intensity

Illuminance

luminaire efficiency

Illumination in architecture – home page

FD Architect Community Forum Discussion

• Illumination – introduction
• Basic Terminology and Definitions
• Laws of Illumination The Inverse Square Law of Illuminance Illuminance (E) at any poi
• Laws of Reflection and Refraction
• Visual efficiency & comfort
• Day lighting
• Components of Daylight Factor
• Artificial Lighting Design

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Illumination.pdf

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