In order to gain access, burglars break locks or windows, and this can be costly to repair. Plus, knowing that someone has been inside your home, looking through your belongings is very upsetting. But if you make it harder for burglars or prowlers to get inside in the first place, it will save you both money and stress.
There are several obvious areas where you need to install automatic security lights. These include your carport, paths and walkways, and all entrances to your house. You should also light up your front gate to deter unwanted visitors from even setting foot on your property. You may even wish to install a device at your entrance that sounds a siren in your house (or beeps or chirps) whenever someone comes in your gate.
It is also advisable to light up any dark alcoves on your property where someone might be able to lurk unseen. This is especially important if you have young children.
Lighting up your property should be your first step in home security. To my mind, it is the cheapest and most effective form of deterrent.