You mean a compact fluorescent light, or CFL. I personally haven't seen one that big in person, but depending on your situation they may work OK - CFLs may or may not like cold weather, and they generally aren't designed to be installed inside an enclosed light fixture. Also, some people don't like the color of light CFLs give off, but that's a personal preference - I have a couple 100 watt equivalent CFL bulbs in the desk lamps here in my office and I think they're fine.