## Spectral Luminous Efficacy Solution

STEP 0: Pre-Calculation Summary
Formula Used
Spectral Luminous Efficacy = Maximum Sensitivity*Photopic Efficiency Value
Kλ = Km*Vλ
This formula uses 3 Variables
Variables Used
Spectral Luminous Efficacy - (Measured in Lumen Per Watt) - Spectral Luminous Efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt (lm/w).
Maximum Sensitivity - (Measured in Lumen Per Watt) - The maximum sensitivity for photopic vision, which occur at 555nm.
Photopic Efficiency Value - Photopic efficiency value of the photopic spectral luminous efficiency function for that wavelength.
STEP 1: Convert Input(s) to Base Unit
Maximum Sensitivity: 55.8 Lumen Per Watt --> 55.8 Lumen Per Watt No Conversion Required
Photopic Efficiency Value: 45.9 --> No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Kλ = Km*Vλ --> 55.8*45.9
Evaluating ... ...
Kλ = 2561.22
STEP 3: Convert Result to Output's Unit
2561.22 Lumen Per Watt --> No Conversion Required
2561.22 Lumen Per Watt <-- Spectral Luminous Efficacy
(Calculation completed in 00.020 seconds)
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## Credits

Created by Aman Dhussawat
GURU TEGH BAHADUR INSTITUTE OF TECHNOLOGY (GTBIT), NEW DELHI
Aman Dhussawat has created this Calculator and 50+ more calculators!
Verified by Parminder Singh
Chandigarh University (CU), Punjab
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## < 6 Methods of Lighting Calculators

Intensity of Light Transmitted
Intensity of Transmitted Light = Intensity of Light Entering the Material*exp(-Absorption Coefficient*Path Length)
Number of Floodlighting Units
Number of Floodlighting Units = (Area to be Lighted*Illumination Intensity)/(0.7*Lumen Flux)
Spectral Transmission Factor
Spectral Transmission Factor = Transmitted Spectral Emission/Spectral Irradiation
Spectral Reflection Factor
Spectral Reflection Factor = Reflected Spectral Emission/Spectral Irradiation
Spectral Luminous Efficacy
Spectral Luminous Efficacy = Maximum Sensitivity*Photopic Efficiency Value
Luminance for Lambertian Surfaces
Luminance = Illumination Intensity/pi

## < 16 Advanced Illumination Calculators

Beer-Lambert Law
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
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
Refracted Angle = arcsinh((Refractive Index of Medium 1*sin(Incident Angle))/(Refractive Index of Medium 2))
Incident Angle using Snell's Law
Incident Angle = arcsinh((Refractive Index of Medium 2*sin(Refracted Angle))/(Refractive Index of Medium 1))
Intensity of Light Transmitted
Intensity of Transmitted Light = Intensity of Light Entering the Material*exp(-Absorption Coefficient*Path Length)
Illumination by Lambert Cosine Law
Illumination Intensity = (Luminous Intensity*cos(Illumination Angle))/(Length of Illumination^2)
Number of Floodlighting Units
Number of Floodlighting Units = (Area to be Lighted*Illumination Intensity)/(0.7*Lumen Flux)
Lambert's Cosine Law
Illuminance at Angle of Incidence = Illumination Intensity*cos(Incident Angle)
Spectral Transmission Factor
Spectral Transmission Factor = Transmitted Spectral Emission/Spectral Irradiation
Spectral Reflection Factor
Spectral Reflection Factor = Reflected Spectral Emission/Spectral Irradiation
Utilization Factor of Electrical Energy
Utilization Factor = Lumen Reaching Working Plane/Lumen Emitting from Source
Spectral Luminous Efficacy
Spectral Luminous Efficacy = Maximum Sensitivity*Photopic Efficiency Value
Inverse Square Law
Luminance = Intensity of Transmitted Light/Distance^2
Specific Consumption
Specific Consumption = (2*Input Power)/Candle Power
Luminance for Lambertian Surfaces
Luminance = Illumination Intensity/pi
Luminous Intensity
Luminous Intensity = Lumen/Solid Angle

## Spectral Luminous Efficacy Formula

Spectral Luminous Efficacy = Maximum Sensitivity*Photopic Efficiency Value
Kλ = Km*Vλ

## What is CIE luminous spectral e fficiency?

The International Commission on Illumination (CIE) uses the spectral luminous efficiency function V(λ) to describe the light brightness that humans can perceive. It states that people are more sensitive to light in the middle wavelengths than either short or long wavelengths.

## How to Calculate Spectral Luminous Efficacy?

Spectral Luminous Efficacy calculator uses Spectral Luminous Efficacy = Maximum Sensitivity*Photopic Efficiency Value to calculate the Spectral Luminous Efficacy, The Spectral Luminous Efficacy formula is defined as a luminous efficiency function or luminosity function represents the average spectral sensitivity of human visual perception of light. Spectral Luminous Efficacy is denoted by Kλ symbol.

How to calculate Spectral Luminous Efficacy using this online calculator? To use this online calculator for Spectral Luminous Efficacy, enter Maximum Sensitivity (Km) & Photopic Efficiency Value (Vλ) and hit the calculate button. Here is how the Spectral Luminous Efficacy calculation can be explained with given input values -> 2561.22 = 55.8*45.9.

### FAQ

What is Spectral Luminous Efficacy?
The Spectral Luminous Efficacy formula is defined as a luminous efficiency function or luminosity function represents the average spectral sensitivity of human visual perception of light and is represented as Kλ = Km*Vλ or Spectral Luminous Efficacy = Maximum Sensitivity*Photopic Efficiency Value. The maximum sensitivity for photopic vision, which occur at 555nm & Photopic efficiency value of the photopic spectral luminous efficiency function for that wavelength.
How to calculate Spectral Luminous Efficacy?
The Spectral Luminous Efficacy formula is defined as a luminous efficiency function or luminosity function represents the average spectral sensitivity of human visual perception of light is calculated using Spectral Luminous Efficacy = Maximum Sensitivity*Photopic Efficiency Value. To calculate Spectral Luminous Efficacy, you need Maximum Sensitivity (Km) & Photopic Efficiency Value (Vλ). With our tool, you need to enter the respective value for Maximum Sensitivity & Photopic Efficiency Value 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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