• Don’t use a CFL in a fully enclosed, recessed fixture, as the heat will cause the CFL to work improperly. However, CFLs will generally work if the fixture is not completely recessed. Check the packaging to see if the CFL can be used in an inverted position. 
  
  
• Don’t use a regular CFL with a dimmer switch—this will cause the bulb to burn out in days or weeks. Choose a CFL made specifically for use with dimmers. 
  
  
• Don’t expect a regular CFL to produce three levels of brightness on a three-way switch. While a CFL will work properly on the middle switch, a regular CFL will not produce light like an incandescent bulb in a three-way switch. However, some manufacturers produce three-way CFLs. 
  
  
• Don’t use a CFL where you turn the lights on and off a lot or leave them burning for just a few minutes at a time (like in the closet). Turning the light on and off more than 20 times a day may negate the long lifespan of the bulb. CFLs are best for applications where the light will stay on for 15 minutes or longer. 
  
  
• Don’t expose a CFL to the outdoor elements without a protective cover. Check the packaging for the range of operating temperatures. 
  
  
• Don’t use a CFL in a fixture with a lot of vibration, such as a ceiling fan or in conjunction with a garage door opener. Vibrations can cause a CFL to fail. 
  

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