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Spreadsheet use for conversion of visible light lux measurements to irradiance.

Back up for manuscript: Calculation of Visible Light Irradiance from Lux Illuminance and Relative Spectral Illuminance

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References shown in spreadsheet tabs

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The standard for measurement of solar irradiance utilizes the units of watts per meter squared (W/m2).  Irradiance meters are both costly and limited in the ability to measure low irradiance values.  With a lower cost and higher sensitivity in low light conditions, light meters measure luminous flux per unit area (illuminance) utilizing the units of lumens per meter squared or lux (lx).

Instructions: 

Spreadsheet with ASTMG data with conversion of solar irradiance to light illuminance

Spreadsheet with results of indoor lab testing

Spreadsheet with results of outdoor testing

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The standard for measurement of solar irradiance utilizes the units of watts per meter squared (W/m2).  Irradiance meters are both costly and limited in the ability to measure low irradiance values.  With a lower cost and higher sensitivity in low light conditions, light meters measure illuminance utilizing the unit of Lux.  A conversion factor would enable the use of light meters to evaluate PV performance under low solar irradiance conditions.  This conversion is a supplement to Luminous Efficacy that compares atmospheric light in units of lumens to solar irradiance in un

Instructions: 

Calculations, measurement, and analysis for A Conversion Guide: Solar Irradiance and Lux Illuminance 

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