I do believe they are sensor lights, but I'm not real clear on how them being on in the daytime reinforces your belief the killer arrived in daytime, so you could explain for me. Thanks !!
Visiting the link you gave made me realize something else. Those long, narrow windows to the left of the garage doors would permit Audrey to look outside to see who was in her driveway or at her garage. Highly unlikely she would look out and see a
stranger, open the garage door, and NOT let her doggies loose for protection.
Also, if a
stranger was arriving under false pretences (i.e. door-to-door sales, etc), surely they would use her conventional front door. If they didn't arrive/knock at the conventional entry, and it was just some random dude breaking in, hoping to score money or sex, surely they would have heard two german shepherds barking up a storm, and no way they would choose to enter that particular household.
If anyone had broken in to lie in wait while Audrey was out, those uber-sensitive doggy noses would have picked up the scent immediately ... in which case, i'm pretty sure Audrey would NOT have confined the dogs.