Online Light Calculators & Light Measurement Unit Conversion Calculators
ILT is pleased to provide these free, easy-to-use light calculators for converting between various light measurement units. Click the download link under each description to download the file. Please visit our Light Measurement System page if you need light measurement equipment.
Use this converter to either convert your Foot-Candle detector sensitivity factor to Lux or vice-versa for continuous measurement in the opposite unit or convert a single reading already taken in Foot-Candles to Lux or vice-versa. Read more.
Lux or Foot-Candles to Total Lumens Converter
Use this online calculator to calculate the approximate total lumen output of a light source based on measurements taken in Lux or Foot-candles at a specific distance. Please note that this is a geometry conversion and and can only be used to get the APPROXIMATE total lumen output. Read more.
Inverse Square Law of Light Calculator
Use this inverse square law of light calculator to find out how an irradiance/illuminance measurement taken at a particular distance from a source will change as the distance to the source increases or decreases. Read More.
Beam Intensity Typical/Custom Measurement Range Calculator
This calculator will calculate typical beam intensity min/max ranges for a system you may be interested in purchasing based on your intended measurement distance to help determine if it will meet your measurement specifications/requirements. This calculator may also be used to calculate the min/max measurement ranges in beam intensity as well as new sensitivity factors to measure directly in beam intensity based on your existing systems sensitivity factor in foot-candles/lux. Read more.
Exposure Value (EV)/Lux Converter
Use this online calculator to convert exposure values (EV) to Lux and Lux to EV. Read more.
QNDS Self-Calibration Calculator
Use this calculator to obtain a new calibration sensitivity factor for a detector when a neutral density filter (QNDS1, QNDS2 OR QNDS3) is added to the assembly in the field. Read more.
Light Source Irradiance (Watts/m2 or W/cm2) to Total Watts Converter
Use this online calculator to calculate the approximate total watt output (optical power) of a light source based on irradiance measurements taken in W/m2 or W/cm2 at a specific distance. Please note that this is a geometry conversion and and can only be used to get the APPROXIMATE total watt output (optical power). Read more.