Question

What are the different units of light?

Answer 1

Light:

1. Light is a sort of radiation that travels in space.
2. Light is used by animals such as humans to perceive and comprehend their surroundings. All of the lights appear to be exceptional, but they are actually simply another type of electromagnetic energy, similar to microwaves and radiofrequency.
3. Light generally travels in single-direction beams and reflects and refracts in extremely exact ways as it passes across space.
4. Because light is not a physical quantity, it cannot be quantified. As a result, talking about the unit of light makes little sense in actuality.

Units of light:

There are three main units of light, such as:

Candela:

1. The candela is the SI's basic unit of luminous intensity, referring to the luminous power per unit solid angle generated by a pointed light source in a given direction.
2. Luminous intensity, on the other hand, is comparable to radiant intensity, except that instead of simply adding up the amounts of each light's wavelength inside the spectrum of the resources, the contribution of each wavelength has been normalized by the standard luminosity function.

Lumen:

1. The lumen is the SI unit of luminous flux or the rate at which light is emitted from a source.
2. Luminous flux varies from radiating flux within this radiant flux encompasses all generated electromagnetic waves, whereas flux is balanced according to a representation of the sensitivity of the visual system to different wavelengths.
3. The lumen can be represented as $1\mathrm{lm}=1\mathrm{cd}·\mathrm{sr}$.

Lux:

1. The lux is a SI unit of illuminance and luminous emissivity that measures flux per unit area and is equivalent to one lumen for every square meter.
2. It is indeed a measurement of the intensity of light that strikes or travels through a substrate in photometry.
3. It can be represented as $$\begin{gathered} 1\mathrm{lx}=1\mathrm{lm}/{\mathrm{m}}^2 \\ =1\mathrm{cd}•\mathrm{sr}/{\mathrm{m}}^2 \end{gathered}$$