I have a small growing room with two 48" 4-bulb T-5 grow lights. They work great for starting plants and keeping some tropicals(papaya mostly) alive through the winter (also using a heat mat and draped plastic from one of the lights...giving it a greenhouse effect holding in the warmth). The room isn't heated and on really cold nights can get down into the 40's. Normally it's temperature will be in a 50-70F range.

Now i'd like to try to grow tomatoes through the winter and since they probably won't be on a heat mat (although I can start the seeds on the heat mat) I need to try some varieties that work better in cooler conditions. I already have seeds for Legend, Oregon Spring, and SIletz, all determinate types.

Are there any tomato varieties that others are using successfully for indoor growing in similar conditions?