I had most of my orchids in the backyard this summer and they loved it. The temperatures are dropping now and I have a 4' x 4 bulb T5HO over a shelving unit in my unheated garage. I still have the den. kingianum, and cymbidiums out there, but moved the more cold sensitive plants inside the house and garage. Nothing fancy, but I think it'll do the trick. Here's a pic: