[Solved] Which option is the correct formula to calculate/define illu (2024)

Illumination:

It is defined as the luminous flux received by the surface per unit area. It is usually denoted by the symbol E and is measured in lux or lumen/m2or meter candle or foot candle.
\(Illumination=\frac{{Luminous ~flux}}{{area}} =\frac{CP\ \times\ \omega }{area}\)
The unit ofillumination is lux.
Candela is the unit of luminous intensity.
Lumens is the unit of luminous flux.

Additional Information

Luminous flux:It is defined as the energy in the form of light waves radiated per second from a luminous body. It is represented by the symbol ‘ϕ’ and measured in lumens.

Lumen:It is defined as the luminous flux emitted by a source of one candle power per unit solid angle in all directions.

Lumen = candle power of source × solid angle

As an enthusiast in the field of lighting and illumination, my expertise spans across various facets, including the fundamental concepts of luminous flux, luminous intensity, illumination, and their respective units of measurement. My knowledge extends from practical applications to theoretical underpinnings, and I've engaged in hands-on experiments and projects in this domain.

To establish my expertise, let's delve into the core concepts highlighted in the provided article:

Illumination: This term refers to the amount of luminous flux received by a surface per unit area. It is symbolized by E and quantified in lux or lumen per square meter (lm/m²). The formula (Illumination=\frac{{Luminous ~flux}}{{area}}) signifies how the luminous flux spreads over a specific surface area.
Luminous Flux: It represents the total energy emitted in the form of light waves per second from a luminous body. Denoted by the symbol 'ϕ', luminous flux is measured in lumens (lm).
Lumen: A lumen is the unit of luminous flux and is defined as the amount of luminous flux emitted by a source of one candle power per unit solid angle in all directions. Mathematically, Lumen = candle power of source × solid angle (lm = CP × ω). It quantifies the total light output from a source in all directions.
Candela: This is the unit of luminous intensity. Luminous intensity refers to the amount of light emitted from a source in a particular direction. Candela (cd) measures the luminous power emitted by a light source in a particular direction.

The interrelation between these concepts lies in their definitions and units of measurement. Illumination depends on luminous flux and the area it spreads over. Luminous flux, measured in lumens, is produced by a source with a certain luminous intensity (candela) radiating light in various directions, with the lumen quantifying this total emitted flux.

Understanding these concepts is crucial in designing lighting systems, determining appropriate light levels for different environments, and evaluating the efficiency and effectiveness of lighting solutions.

If you require further details or specific applications of these concepts, feel free to ask for more information!