I first got the idea for this gadget when I noticed that the lights by my garage would turn on when there was still sunlight outside. The light would turn on too early because the sensor that controls the light is beneath the soffit. When the sun begins to set it casts a shadow on it which causes the light to turn on too early in the evening. Similarly, it turned off too late in the morning when it was already bright outside. Also on cloudy days when the sunlight is blocked the light goes on. I decided that something had to be done about these problems because energy was being wasted which could easily be prevented.
This gadget works by reflecting light from the bright sky into the light sensor. After testing I estimated that in my case, I save 30 minutes of energy in one day including dusk, dawn, cloudy and rainy days.
Step 1: Materials
A metal clamp size 36
Any ordinary wire that can easily be bent, but it holds its shape
A wire connector
A small mirror (In my case I used a periscope mirror. You can also use any small mirror, such as a disposable dental mirror)
A screw driver
This should all cost you a little less than five dollars.