We just added another grow light to the guest room, so I thought I'd fill you in on what we did. We bought a shoplight from Home Depot.
This light holds two flourescent bulbs and can be suspended from the ceiling.
For our setup, I just spread a tarp out on the bed in the guest room, placed plants in under-the-bed storage boxes, and hung the lights from the ceiling.
Seems a small price to pay for the ability to extend our growing season by months!
Also, here's an update on the sweet potatoes. I transferred the plants that had sprouted roots to their own pots. I really only plan on having about 4 plants in the garden, but I've decided to take advantage of having extras and use them as ornamental vines for my pots.