Way back when, I bought my parents a photosensor that was a little black box which plugged into a wall socket & then you plugged the lamp into that. You could put the little black box closer to the window (on the window side of the curtains) and it worked really well, turning the lamp on at dusk, or when the weather made the day really dark.
I have seen units that screw into the lamp between the lamp and the bulb, but they don't do a great job because the curtains interfere with the photosensor's interpretation of light.
Does anyone know where I shoul look for this type of photocell? I've checked all the local places and Googled, but I'm still coming up empty.
Any help appreciated!