Physics Help Forum convert from lux to candela

 Light and Optics Light and Optics Physics Help Forum

 Apr 20th 2017, 05:48 AM #1 Junior Member   Join Date: Apr 2017 Posts: 1 convert from lux to candela hello i'm working on a project that consist on reading the light of LEDs on PCB to determine the color code (R,G,B) and light intensity but the sensor gives me values in LUX which is the illuminance and i need to convert them to Candela I found this formula in wikipedia but i didn't understand how to apply it: 1lx=1Lm/mē=(1cd x sr )/mē
 Apr 21st 2017, 04:54 PM #2 Senior Member     Join Date: Jun 2016 Location: England Posts: 963 I have just spent a few minutes perusing Wikipedia and think I have it... Candela seem to be in polar coordinates, with lux in Cartesian coordinates. A light source of 1 candela intensity gives a luminous flux of 1 lumen per steradian. A light source of 1 lux intensity gives a luminous flux of 1 lumen per square metre. topsquark likes this.

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