CFL light bulbs shapes and sizes
Which compact fluorescent light bulbs do you need?
While CFL light bulbs come in various shapes and sizes, most energy efficient light bulbs can fit any light fixture. However it's important to note that some compact fluorescent light bulbs perform better than others in certain types of light fixtures.
Different types of CFL light bulbs
 Spiral or Twist
The spiral shape tube is designed to somewhat resemble the traditional bulb. While they fit almost all light fixtures, these CFL bulbs are much better suited for indoor use.
Triple tube or Universal Inner tubing provides a greater light output coming from a smaller bulb. These energy saver light bulbs are best suited for indoors and are great replacements for reading lamps.
Covered or Standard Spiral or twist CFL's with a traditional bulb like cover. This provides a more equally distributed light. These bulbs are better suited for indoor use, but can be used in covered outdoor fixtures.
 Globe or Dome
Best suited in bathroom fixtures and those open handing ceiling lamps found usually in stairways and hallways. Best for indoor use but can be used in covered outdoor fixtures.
Candle or Candelabra Designed for smaller light fixtures such as chandeliers and some indoor wall hung fixtures. Indoor use and wont fit most outdoor fixtures.
Flood or Reflector Can be used indoors or outdoors. These compact fluorescent light bulbs can be used in covered or exposed outdoor fixtures such as motion detectors and landscape lighting fixtures.
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