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LDR Calibration ? Answered

I am planning to build a lumenmeter but I am not getting how to calibirate the LDR and do not have any lumen meter so if could tell the estimate lumens out of a 5w CFL or any other device might help


A "lumen meter" needs an integrating sphere, which would be an interesting exercise for a 13 year old to make.

A LUX meter you could sort of create with an LDR.

The LDR won't be linear so you will need a reference right through the range to calibrate it.