I've used photoresistors for hobby projects before, such as this one:
However, now I'm working on a commercial product that needs to sense when it's dark and I'm unsure of whether the circuit I designed on the above page is adequate. The reason I'm concerned is that in my experience photoresistors have very
low wide tolerances (i.e. high deviations in photosensitivity).
If you were designing a low cost circuit that could output a HIGH logic level when dark and LOW logic level when light (or vice-versa), would you use a circuit with a photoresistor like the one I designed, or is there something else that is more reliable?