Luminous intensity (I) is the ability to emit light into a given direction, or it is the luminous flux that is radiated by the light source in a given direction within the unit of the spatial angel. unit :-candela.
I=Φ/Ω
Ω = solid angle into which luminous flux is emitted
Φ = Luminous flux
I = Luminous intensity
Luminous intensity is the amount of light that is emitted in a particular direction from a light source. It is measured in candelas (cd), which is the unit of luminous intensity in the International System of Units (SI).
To understand this better, imagine a light source that emits light in all directions equally. The luminous intensity of the source would be the same in every direction, and would be equal to the total luminous flux (measured in lumens) divided by the solid angle (measured in steradians) over which the light is emitted.
For example, a 1000-lumen light source that emits light uniformly over a solid angle of 1 steradian would have a luminous intensity of 1000 candelas (cd). Similarly, a flashlight that produces a highly directional beam of light would have a higher luminous intensity than a light bulb that emits light in all directions.
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- 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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