You should be ok. Light won't be your issue. I'd be mildly concerned about an infection, though. What is your garage like? If all was quiet there overnight, you probably won't have a problem. Keep in mind, a lot of breweries use open fermenters.
Brody's Brew House
Primary: Spiced ale
Planned: Butternut squash & gala apple harvest ale; brown ale or porter; barley wine
In the fridge: Dogfish 60 minute; Imperial Stout