Earlier today I wrote a pretty scathing review of this outdoor wall light.  I still don't know that it even has a photocell (can't you always see them?  Or can they be invisible?), but the issue with the light not going off when the light switch is on may be due to the configuration of our porch.  It is kind of like a small box with one side missing.  We may be getting reflection.  Still, I am disappointed.  We paid extra money for a light that isn't any better than the one we replaced.