Luminous Intensity Calculator

✖Lumen is a unit of measurement that quantifies the total amount of visible light emitted by a light source. It represents the brightness or light output of the source, irrespective of direction.ⓘ Lumen [Lm]			+10% -10%
✖Solid angle is a measure of the extent of a cone-shaped region in three-dimensional space, originating from a point and defined by its vertex angle. It quantifies the spatial coverage.ⓘ Solid Angle [ω]			+10% -10%

✖Luminous intensity is a measure of the amount of light emitted by a light source in a specific direction. It quantifies the brightness or concentration of light in that direction.ⓘ Luminous Intensity [I_v]

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Formula

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Luminous Intensity

Formula

`"I"_{"v"} = "Lm"/"ω"`

Example

`"1.55cd"="41.85cd*sr"/"27sr"`

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Luminous Intensity Solution

STEP 0: Pre-Calculation Summary

Formula Used

Luminous Intensity = Lumen/Solid Angle
I_v = Lm/ω
This formula uses 3 Variables

Variables Used

Luminous Intensity - (Measured in Candela) - Luminous intensity is a measure of the amount of light emitted by a light source in a specific direction. It quantifies the brightness or concentration of light in that direction.
Lumen - (Measured in Lumen) - Lumen is a unit of measurement that quantifies the total amount of visible light emitted by a light source. It represents the brightness or light output of the source, irrespective of direction.
Solid Angle - (Measured in Steradian) - Solid angle is a measure of the extent of a cone-shaped region in three-dimensional space, originating from a point and defined by its vertex angle. It quantifies the spatial coverage.

STEP 1: Convert Input(s) to Base Unit

Lumen: 41.85 Candela Steradian --> 41.85 Lumen (Check conversion here)
Solid Angle: 27 Steradian --> 27 Steradian No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

I_v = Lm/ω --> 41.85/27

Evaluating ... ...

I_v = 1.55

STEP 3: Convert Result to Output's Unit

1.55 Candela --> No Conversion Required

FINAL ANSWER

1.55 Candela <-- Luminous Intensity

(Calculation completed in 00.004 seconds)

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Created by Prahalad Singh

Jaipur Engineering College and Research Centre (JECRC), Jaipur

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Birsa Institute of Technology (BIT), Sindri

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< 16 Advanced Illumination Calculators

Beer-Lambert Law

Go Intensity of Transmitted Light = Intensity of Light Entering the Material*exp(-Absorption per Concentration Coefficient*Concentration of Absorption Material*Path Length)

Fresnel's Law of Reflection

Go Reflection Loss = (Refractive Index of Medium 2-Refractive Index of Medium 1)^2/(Refractive Index of Medium 2+Refractive Index of Medium 1)^2

Refracted Angle using Snell's Law

Go Refracted Angle = arcsinh((Refractive Index of Medium 1*sin(Incident Angle))/(Refractive Index of Medium 2))

Incident Angle using Snell's Law

Go Incident Angle = arcsinh((Refractive Index of Medium 2*sin(Refracted Angle))/(Refractive Index of Medium 1))

Intensity of Light Transmitted

Go Intensity of Transmitted Light = Intensity of Light Entering the Material*exp(-Absorption Coefficient*Path Length)

Illumination by Lambert Cosine Law

Go Illumination Intensity = (Luminous Intensity*cos(Illumination Angle))/(Length of Illumination^2)

Number of Floodlighting Units

Go Number of Floodlighting Units = (Area to be Lighted*Illumination Intensity)/(0.7*Lumen Flux)

Lambert's Cosine Law

Go Illuminance at Angle of Incidence = Illumination Intensity*cos(Incident Angle)

Spectral Transmission Factor

Go Spectral Transmission Factor = Transmitted Spectral Emission/Spectral Irradiation

Spectral Reflection Factor

Go Spectral Reflection Factor = Reflected Spectral Emission/Spectral Irradiation

Utilization Factor of Electrical Energy

Go Utilization Factor = Lumen Reaching Working Plane/Lumen Emitting from Source

Spectral Luminous Efficacy

Go Spectral Luminous Efficacy = Maximum Sensitivity*Photopic Efficiency Value

Inverse Square Law

Go Luminance = Intensity of Transmitted Light/Distance^2

Specific Consumption

Go Specific Consumption = (2*Input Power)/Candle Power

Luminance for Lambertian Surfaces

Go Luminance = Illumination Intensity/pi

Luminous Intensity

Go Luminous Intensity = Lumen/Solid Angle

Luminous Intensity Formula

Luminous Intensity = Lumen/Solid Angle
I_v = Lm/ω

What Is Polar Curve Of A Lamp?

A polar curve is a convenient way of showing how the candle power of a lamp varies in different directions. Polar curves are used to determine the M.H.C.P.,M.S.C.P. and the actual illumination of a surface by employing the candle power in the particular direction.

How to Calculate Luminous Intensity?

Luminous Intensity calculator uses Luminous Intensity = Lumen/Solid Angle to calculate the Luminous Intensity, Luminous intensity often referred to as candlepower, is a fundamental photometric quantity that describes the amount of visible light emitted by a light source in a specific direction per unit solid angle. It takes into account both the power of the light source and the human eye's sensitivity to different wavelengths of light. Luminous Intensity is denoted by I_v symbol.

How to calculate Luminous Intensity using this online calculator? To use this online calculator for Luminous Intensity, enter Lumen (Lm) & Solid Angle (ω) and hit the calculate button. Here is how the Luminous Intensity calculation can be explained with given input values -> 1.55 = 41.85/27.

FAQ

What is Luminous Intensity?

Luminous intensity often referred to as candlepower, is a fundamental photometric quantity that describes the amount of visible light emitted by a light source in a specific direction per unit solid angle. It takes into account both the power of the light source and the human eye's sensitivity to different wavelengths of light and is represented as I_v = Lm/ω or Luminous Intensity = Lumen/Solid Angle. Lumen is a unit of measurement that quantifies the total amount of visible light emitted by a light source. It represents the brightness or light output of the source, irrespective of direction & Solid angle is a measure of the extent of a cone-shaped region in three-dimensional space, originating from a point and defined by its vertex angle. It quantifies the spatial coverage.

How to calculate Luminous Intensity?

Luminous intensity often referred to as candlepower, is a fundamental photometric quantity that describes the amount of visible light emitted by a light source in a specific direction per unit solid angle. It takes into account both the power of the light source and the human eye's sensitivity to different wavelengths of light is calculated using Luminous Intensity = Lumen/Solid Angle. To calculate Luminous Intensity, you need Lumen (Lm) & Solid Angle (ω). With our tool, you need to enter the respective value for Lumen & Solid Angle and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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