CFLs are available in a range of colours to suit all applications. The higher the Kelvin (K) rating, the bluer the colour gets. Lower Kelvin-rated CFLs have more yellow and are similar to the light colour of an incandescent globe. The Kelvin rating only refers to the colour of the light emitted, not the brightness. Different colours suit different rooms.
Bright daylight (6500K) offers a strong, bright light suited to home offices and work spaces. Cool white (4000K) is suited to task environments like kitchens and laundries. Warm white (2700K) creates a more intimate atmosphere for bedrooms and lounge rooms.
Because CFLs are more efficient, they require a lower wattage globe for the same light output. Check the chart below to see the difference.