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Illumination Formula

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Illumination intensity refers to the level or strength of light in a given area. It quantifies the amount of light reaching a surface and is typically measured in units such as lux or foot-candles. Check FAQs

E v = \frac{F}{A}

E_v - Illumination Intensity?F - Luminous Flux?A - Area of Illumination?

Illumination Example

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Here is how the Illumination equation looks like with Values.

Here is how the Illumination equation looks like with Units.

Here is how the Illumination equation looks like.

1.0244 = \frac{42}{41}

1.0244lx = \frac{42lm}{41m²}

1.0244 = \frac{42}{41}

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Illumination Solution

Follow our step by step solution on how to calculate Illumination?

FIRST Step Consider the formula

E v = \frac{F}{A}

Next Step Substitute values of Variables

∴

E v = \frac{42lm}{41m²}

Next Step Prepare to Evaluate

∴

E v = \frac{42}{41}

Next Step Evaluate

∴

E v = 1.02439024390244lx

LAST Step Rounding Answer

∴

E v = 1.0244lx

Illumination Formula Elements

Variables

Illumination Intensity

Illumination intensity refers to the level or strength of light in a given area. It quantifies the amount of light reaching a surface and is typically measured in units such as lux or foot-candles.

Symbol: E_v

Measurement: IlluminanceUnit: lx

Note: Value can be positive or negative.

Formulas to find Illumination Intensity

Luminous Flux

Luminous flux is a measure of the total amount of light emitted by a light source in all directions. It quantifies the overall brightness or output of the source.

Symbol: F

Measurement: Luminous FluxUnit: lm

Note: Value can be positive or negative.

Formulas to find Luminous Flux

Area of Illumination

Area of illumination refers to the size or extent of the space covered by light from a source, determining the reach and coverage of light in that area.

Symbol: A

Measurement: AreaUnit: m²

Note: Value should be greater than 0.

Formulas to find Area of Illumination

Other formulas in Illumination Parameters category

Go Solid Angle

ω = \frac{A}{r^{2}}

Go Reduction Factor

RF = \frac{M.S.C.P.}{M.H.C.P.}

Go Number of Lamps Required for Illumination

N Lamp = \frac{E v \cdot A}{F \cdot UF \cdot MF}

Go Mean Spherical Candle Power

M.S.C.P. = \frac{F}{4 \cdot π}

How to Evaluate Illumination?

Illumination evaluator uses Illumination Intensity = Luminous Flux/Area of Illumination to evaluate the Illumination Intensity, The Illumination formula is defined as the number of lumens, falling on the surface, per unit area. It is denoted by symbol E and is measured in lumens per square meter or lux or meter-candela. Illumination Intensity is denoted by E_v symbol.

How to evaluate Illumination using this online evaluator? To use this online evaluator for Illumination, enter Luminous Flux (F) & Area of Illumination (A) and hit the calculate button.

FAQs on Illumination

What is the formula to find Illumination?

The formula of Illumination is expressed as Illumination Intensity = Luminous Flux/Area of Illumination. Here is an example- 1.02439 = 42/41.

How to calculate Illumination?

With Luminous Flux (F) & Area of Illumination (A) we can find Illumination using the formula - Illumination Intensity = Luminous Flux/Area of Illumination.

Can the Illumination be negative?

Yes, the Illumination, measured in Illuminance can be negative.

Which unit is used to measure Illumination?

Illumination is usually measured using the Lux[lx] for Illuminance. Candela Steradian per Sq Meter[lx] are the few other units in which Illumination can be measured.

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