I need the opposie of most of the projects I am finding. I want one that turns ON in daylight and off in the dark. It seems an LDR will do this, but everyone seems to use it to turn the system on in the dark. I am a newbie so don't assume I know anything. I will be plugging the system into 120 V and controlling a small (<2 Amp) water pump. I want the water to flow during the day and off at night. If there is a commercially available product, point me that way too. Thanks so much