I bought some CFs in a glass floodlight enclosure, not the large but medium size, at Home Depot a couple of years ago. I think they were about 17, maybe 25 watts and completely enclosed and weathertight. Only thing is, they specifically say they are not to be used on a motion sensitive-type circuit as the chopped AC that substitutes for smooth 60Hz AC on a regular switch circuit causes their early demise. I was using them in my basement in ceiling pots on just such a circuit (the lights come on when you walk into the room) and, though they provided a nice light, they did fail early. So, if they will be used on a simple switched circuit I would do it. They were a little slow to come up to full brightness - about 1 minute, but they work. I am also using the regular indoor type in a back door fixture that is not totally protected from the weather and it is doing fine, too, and been in use for 3 years.