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Resistance to illuminance conversion

  1. Apr 17, 2012 #1
    I have conducted an experiment to measure the changes in voltage/current due to the resistance changes of a photocell present in an LDR.
    I wanted to know how I could use those values in order to calculate the illuminance present on the surface of the photocell.
    I did not use a voltage differential circuit.
    I looked at some websites and all the related experiments were simply using differential circuits.

    Is there an LDR resistance to luminance conversion equation or something similar.
  2. jcsd
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