I am no expert on what thieves like, personally I am not convinced with security lights as after a while people just ignore them. You can't go out to investigate everytime they light up, particularly if there are local cats.
If thieves love the dark, how do they see?
I would think they need light, if things are suddenly lit up, even by torch light, that change from the norm can be noticed and may attract attention.
I don't know the answer, but if serious thieves want a car, I guess they will take it.
The disclock and other anti theft devices makes more sense to me as that has to take time to tackle, so may discourage the opportunist.