Lumens Calculator

✖Candle power is an older term used to describe the intensity of light emitted by a source, but it has largely been superseded by the SI unit candela for modern illumination measurements.ⓘ Candle Power [CP]			+10% -10%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%

✖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.ⓘ Lumens [Lm]

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Formula

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Lumens

Formula

`"Lm" = "CP"*"ω"`

Example

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

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Lumens Solution

STEP 0: Pre-Calculation Summary

Formula Used

Lumen = Candle Power*Solid Angle
Lm = CP*ω
This formula uses 3 Variables

Variables Used

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.
Candle Power - (Measured in Candela) - Candle power is an older term used to describe the intensity of light emitted by a source, but it has largely been superseded by the SI unit candela for modern illumination measurements.
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

Candle Power: 1.55 Candela --> 1.55 Candela No Conversion Required
Solid Angle: 27 Steradian --> 27 Steradian No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Lm = CP*ω --> 1.55*27

Evaluating ... ...

Lm = 41.85

STEP 3: Convert Result to Output's Unit

41.85 Lumen -->41.85 Candela Steradian (Check conversion here)

FINAL ANSWER

41.85 Candela Steradian <-- Lumen

(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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Verified by Payal Priya

Birsa Institute of Technology (BIT), Sindri

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< 15 Illumination Parameters Calculators

Number of Lamps Required for Illumination

Go Number of Lamp = (Illumination Intensity*Area of Illumination)/(Luminous Flux*Utilization Factor*Maintenance Factor)

Index of Refraction

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

Luminance

Go Luminance = Luminous Intensity/(Area of Illumination*cos(Illumination Angle))

Luminous Flux

Go Luminous Flux = (Area of Illumination*Luminous Intensity)/(Length of Illumination^2)

Reduction Factor

Go Reduction Factor = Mean Spherical Candle Power/Mean Horizontal Candle Power

Mean Horizontal Candle Power

Go Mean Horizontal Candle Power = Sum of Candle Power/Number of Lamp

Solid Angle

Go Solid Angle = Area of Illumination/(Radius of Illumination^2)

Maintenance Factor

Go Maintenance Factor = Final Illumination/Initial Illumination

Illumination

Go Illumination Intensity = Luminous Flux/Area of Illumination

Mean Hemi-Spherical Candle Power

Go Mean Hemi Spherical Candle Power = Luminous Flux/(2*pi)

Mean Spherical Candle Power

Go Mean Spherical Candle Power = Luminous Flux/(4*pi)

Lamp Efficiency

Go Lamp Efficiency = Luminous Flux/Input Power

Candle Power

Go Candle Power = Luminous Flux/Solid Angle

Lumens

Go Lumen = Candle Power*Solid Angle

Depreciation Factor

Go Depreciation Factor = 1/Maintenance Factor

Lumens Formula

Lumen = Candle Power*Solid Angle
Lm = CP*ω

How bright is a lumen?

Lumens measure how much light you are getting from a bulb. More lumens means it's a brighter light; fewer lumens means it's a dimmer light.

How to Calculate Lumens?

Lumens calculator uses Lumen = Candle Power*Solid Angle to calculate the Lumen, The Lumens formula is defined as the product of the candle power and solid angle. It is denoted as L. Lumen is denoted by Lm symbol.

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

FAQ

What is Lumens?

The Lumens formula is defined as the product of the candle power and solid angle. It is denoted as L and is represented as Lm = CP*ω or Lumen = Candle Power*Solid Angle. Candle power is an older term used to describe the intensity of light emitted by a source, but it has largely been superseded by the SI unit candela for modern illumination measurements & 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 Lumens?

The Lumens formula is defined as the product of the candle power and solid angle. It is denoted as L is calculated using Lumen = Candle Power*Solid Angle. To calculate Lumens, you need Candle Power (CP) & Solid Angle (ω). With our tool, you need to enter the respective value for Candle Power & 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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