Twisties (compact fluorescent bulbs) are not universal. Different CFLs are required for different applications and use. CFLs may lack information on the packaging, or provide conflicting information about safe product use.
The rule of thumb is as follows: unless otherwise specified, CFLs should not be used in totally enclosed recessed fixtures, with dimmer switches, in touch lamps with photocells or with electronic timers, where exposed to weather, or where exposed to water.
New products on the market have made choosing the right bulb for the job more challenging. The length of the bulb aisle at our local retailers is solid proof of this challenge.