I think a "light grenade" that goes on on impact with the ground is very feasible, why not? They could even be disposable, or stay on bright for only a set time, say one minute.
I really like outside motion detector triggered lights, esp those that are independent of house power and run on solar charged batteries. They will still work if your house power is cut.
I hadn't thought about the solar lights. My son has a couple but he never uses them because they're near the street by a light pole. They were there just for a decoration.
I thought of the idea of the light when I noticed I was playing a computer game and I came to a long hallway. I learned how to clear rooms from Doom, Delta Force[The game, that is] and a class at the Whittington Center.
I read a account of motion detectors from a magazine that said that burgulars fear those than a standard light. They never knew whether or not the homeowner was putting the light on.