Question
Download Solution PDFThe quantity that describes the light giving radiant power of a luminaire in any particular direction is called ________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFLuminous intensity
- It is a measure of the power emitted by a light source in a particular direction per unit solid angle.
- The SI base unit of luminous intensity is Candela.
It is given by:
where, I = Luminous intensity
ϕ = Luminous flux
ω = Solid angle
Luminous flux
- It indicates how much light is emitted by a light source in all directions.
- The SI base unit of luminous flux is lumens.
luminance
- luminance is the total luminous flux incident on a surface, per unit area.
- It is a measure of how much the incident light reaches the surface.
- The SI base unit of luminance is lux.
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