Now this is good and like all the best ideas, simple! More than just flicking on a security light, following the source of movement with a directed beam of bright light and recording is really improving the deterrent quotient.
I would also like to see a sound effect such as a barking dog or gunshot sound to further frighten the prospective robber.
CONS: Make the sensitivity settings easy to use or we might end up with a whole load more 'startled cat' videos and memes on the net!