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Illuminance Formula

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Illumination is defined as the number of lumens, falling on the surface, per unit area. Check FAQs

E = \frac{Φ m}{A}

E - Illumination?Φ_m - Magnetic Flux?A - Surface Area?

Illuminance Example

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Here is how the Illuminance equation looks like with Values.

Here is how the Illuminance equation looks like with Units.

Here is how the Illuminance equation looks like.

8.0702 = \frac{230}{28.5}

8.0702lx = \frac{230Wb}{28.5m²}

8.0702 = \frac{230}{28.5}

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Illuminance Solution

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

FIRST Step Consider the formula

E = \frac{Φ m}{A}

Next Step Substitute values of Variables

∴

E = \frac{230Wb}{28.5m²}

Next Step Prepare to Evaluate

∴

E = \frac{230}{28.5}

Next Step Evaluate

∴

E = 8.07017543859649lx

LAST Step Rounding Answer

∴

E = 8.0702lx

Illuminance Formula Elements

Variables

Illumination

Illumination is defined as the number of lumens, falling on the surface, per unit area.

Symbol: E

Measurement: IlluminanceUnit: lx

Note: Value should be greater than 0.

Formulas to find Illumination

Magnetic Flux

Magnetic Flux is the number of magnetic field lines passing through a surface.

Symbol: Φ_m

Measurement: Magnetic FluxUnit: Wb

Note: Value should be greater than 0.

Formulas to find Magnetic Flux

Surface Area

Surface Area refers to the total area of a surface that light rays strike. This area determines the amount of light energy absorbed, reflected, or transmitted by the surface.

Symbol: A

Measurement: AreaUnit: m²

Note: Value should be greater than 0.

Formulas to find Surface Area

Other formulas in Light Measurement category

Go Area affected by Light Incident

A = \frac{L p}{H}

Go Intensity on Solid Angle

I = \frac{Φ m}{Ω}

Go Flux at Solid Angle

Φ m = I \cdot Ω

Go Reflected Luminous Flux

Φ r = Φ i \cdot ρ

How to Evaluate Illuminance?

Illuminance evaluator uses Illumination = Magnetic Flux/Surface Area to evaluate the Illumination, The Illuminance formula is defined as is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. Illumination is denoted by E symbol.

How to evaluate Illuminance using this online evaluator? To use this online evaluator for Illuminance, enter Magnetic Flux (Φ_m) & Surface Area (A) and hit the calculate button.

FAQs on Illuminance

What is the formula to find Illuminance?

The formula of Illuminance is expressed as Illumination = Magnetic Flux/Surface Area. Here is an example- 8.070175 = 230/28.5.

How to calculate Illuminance?

With Magnetic Flux (Φ_m) & Surface Area (A) we can find Illuminance using the formula - Illumination = Magnetic Flux/Surface Area.

Can the Illuminance be negative?

No, the Illuminance, measured in Illuminance cannot be negative.

Which unit is used to measure Illuminance?

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

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Illuminance Formula

Illuminance Example

Illuminance Solution

Illuminance Formula Elements

Other formulas in Light Measurement category

How to Evaluate Illuminance?

FAQs on Illuminance

Variable Name