Illuminance

Illuminance is the measure of the amount of light that falls onto a surface per unit area. It is measured in lux (lx), which is the SI unit of illuminance.

E=Φ/A

A= Illuminated surface (m²)

Φ = Luminous flux (lumen)

E = Illuminance (lux)

Illuminance depends on the distance between the light source and the surface, as well as the intensity and directionality of the light. For example, a light source that is closer to a surface will produce a higher illuminance than the same light source that is farther away.

To calculate illuminance, the luminous flux (measured in lumens) of the light source is divided by the surface area (measured in square meters) that the light falls onto. This gives the illuminance in lux.

For example, a 1000-lumen light source that illuminates an area of 10 square meters would produce an illuminance of 100 lux. Illuminance is an important parameter for designing lighting systems, as it determines the amount of light that is available for a given task or activity.

Luminous flux

Luminous  intensity

Luminance 

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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