David, I don't have adequate lighting in my garage and I only have 1 window which faces NE, but I'm working on getting DH to set up some shelves with florescent lights for my plants in the garage.
I too want to save my angelonias and calibrachoas. I usually just let my hibiscus, brugs, orchid cactus, clivias and sometimes pothos go dormant. I also store some of my bulbs in there. Last year I overwintered my cactus and succulents successfully under the one florescent fixture in there. I've since increased my collection, therefore, the need for additional shelves and lighting.
BATS: Bayer Advanced Tree & Shrub - a systemic insecticide