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Light sensor consists of an on board LDR. It has 3 pins namely VCC, GND and OUT. From the OUT pin you have to measure the change of voltage across the LDR.
http://emant.com/316002.page
Lux = ((500*Aref/(ADC_Reading*ADC_Resolution))-500)/(R_of_Voltage_Divider_in_KOhm)
works well for indoor measurement !
For this module, R_of_Voltage_Divider_in_KOhm = 10