I want to save money and energy by switching to CFL bulbs but how do I know which bulbs I need?

Crosss Reference Guides for Pin Based CFL Lamps

T4 Duo Tube - 2 Pin Base - Beveled End -Cross Reference 

T4 Quad Tube - 2 Pin Base - Beveled End - CFL Cross Reference

T4 Triple Tube - 4 Pin Base - Beveled End - CFL Cross Reference

T5 Duo Tube - 2G11 Base - H Type End - Compact Flourescent Cross Reference

T4 Quad Tube - 4 Pin Base - Beveled End - CFL Cross Reference

1. Start by interior or exterior.

2. Select the room

3. What is type of fixture

4. Choose your color

Exterior bulbs exposed to the elements may require moisture protection to stop rain and snow from damaging the bulb.  Flood lights are known in the lighting industry are PAR (parabolic reflectors).  The cone shape of the bulb has a reflective surface that directs the bulb in a spotlight at a certain part of your yard, sidewalk or entryway.  Indoor floods are called R.  The number 20, 30, 40 etc. after the PAR or R is the diameter of the bulb.  A R30 bulb would be used in recessed lighting in your living room or kitchen.  A PAR30 bulb would be used in an exterior flood light.

Work areas like garages, basements and shops generally use a bright white 4100K or more.  Use higher wattage bulbs for more light (lumens) to make tools, surfaces and equipment safely lit.

Bedrooms benefit from warmer color (more yellow) and less wattage.  The lower light creates a calm, inviting atmosphere.  Look for 2700K warm or soft white bulbs between 13 watts and 20 watts.

To ensure you have the same amount of light with your new CFL as you did with your standard incandescent or halogen bulbs, use this table.