Luminous flux

Luminous flux (Φ) is the quantity of the energy of the light emitted per second in all directions.

Unit :- lumen (lm).

Luminous flux is a measure of the total amount of visible light that is emitted by a light source in all directions. It is the measure of the perceived power of light, weighted by the sensitivity of the human eye to different wavelengths of light. Luminous flux is measured in lumens (lm) and is a useful metric for comparing the brightness of different light sources.

The lumen is the SI unit of luminous flux and is defined as the amount of light emitted by a point source of one candela (cd) of luminous intensity, uniformly in all directions.

For example, a 60-watt incandescent light bulb typically emits around 800 lumens of light, while a 10-watt LED light bulb can emit the same amount of light or more, depending on its efficiency. However, the quality of the light emitted by different light sources can also affect their perceived brightness, even if they have the same luminous flux.

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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