LED wall light or lamp bulbs with E27 base fitting.
These bulbs are perfect for outdoor lighting of paths and doorways. As they run on such tiny wattage they can be left on all night and cost virtually nothing to run.
The light is perfect for illuminating paths and drives without producing horrible bright glare.
These very high quality bulbs will last for 50,000 as they are not subject to failure by heat or constant switching on and off (which is a cause of incandescent bulbs failing prematurely).
They also have no harmful toxins which are contained in CFL low energy bulbs and require far less wattage than their CFL equivalent.