I keep mine from spinning by bracing them against stuff, kinda, as necessary. Otherwise, yeah, they might spin and cause probs. Keep in mind that I am using sets of four bulbs, which makes them more stable. I'll show you a pic of my WalMart CFL four-way connection deal, so you can see what I am talking about. With four bulbs and the connection hardware, this makes them heavy enough that they don't blow around all that much, and with four of them, there are more ways to brace them against stuff when needed.