There are 4 types of security lighting: manual lighting, timer operated lighting, movement sensor lighting and dusk til dawn lighting.
The disadvantage of using manually operated security lighting is you can't operate the lighting to protect your home when you are away on holiday, which is probably the time it is most at risk from burglary.
Timer operated security lights are programmed to turn on and off automatically whenever suits. Some allow for multiple lighting periods over a 24 hour period. Although some timer operated lights can be used outdoors, they are probably better suited to indoor use - where they can be used to give the impression that your home is occupied when you are away.
Most movement sensor lighting is tungsten halogen lamps that are operated by passive infra-red receiver (PIR). These lights are rather energy inefficient. However, there are now a few solar powered movement sensor lights on the market. Motion sensors are often triggered by animals and numerous false activations can both increase fear of crime and desensitize owners ("Oh - it was probably just the cat!").
These lights come on automatically as it gets dark and go off again as it starts to get light. This kind of security lighting is much more energy efficient than movement sensor lights. It also has advantages in addition to security - the light is aesthetically pleasing and convenient for the occupants of the property if they want to sit out in the garden and night.