Early this year we added a battery powered LED motion detecting light
up our apartment's front stairway. It worked really well, scaring away the miscreants who often loitered around our area during late weekend nights...so well, that someone eventually stole it! We're still debating whether to replace it, but we might do it with one of these Solar Powered Courtesy Lights...
The Solar Powered Security Light from Gizoo is basically the same as the previous model, but with a nicer weather proof wedge design. The unit offers 8 meters lighting distance of detection within 100 degree angle; a 60 second LED illuminated light keeps your area lit up without the need for wires, thanks to a large solar panel ontop, making this a good stairway light. Available for about $48 from Gizoo