I think barry1010 is talking about security cameras.
The LED type with a PIR sensor will be far more energy efficient and I would recommend getting an electrician in to hardwire them in rather than putting a plug on them and plugging them into a socket.
There are many on the market and I would ask an electrician for advice on the best ones to buy.
Someone I know who advises people on the subject of security said it is best to set security lights to come on for about ten seconds if they are activated, so that if an intruder is moving about, the light will flash. People will take more notice of a flashing light than one that stays on.