The energy that I want to lower is the electricity used by lights at home. Often when we turn the switch and the light goes on, it stays as one brightness, no matter how dark the room is, which for the most times, is brighter than needed. That wastes a lot of electricity. Of course, there are homes with adjustable lights that you can decide how bright or dim you want your lights to be. For example, I have one just like that, where I can decide how I want the brightness to be. However, I often forget or am just too lazy to spend that time to adjust lights or cannot find the right brightness to make out the best usage of energy without wasting. And now, this problem can be solved with the device I have decided to make, which is auto-adjust lights. With this device, all I have to do is to flip the switch, and based on the darkness of the room, it will auto adjust itself to the right brightness, no more, no less. This device will save a lot of energy and money, there will be no worries about that bill every month going overpriced! Not only it saves money it also helps our mother Earth to face the climate change and energy shortage problem, big win! This type of device has been tested by other scientists and was announced last year as a success, so I think I will make the same or similar functioned device that will just do the right thing.