by Sparaxis » Tue 14 Jun 2005, 12:27:31
For best results, buy only Energy Star-labled CFLs (many utilities subsidize the price--you can get the nice twisted ones at Home Depot here in 6 packs for only $2/apiece). The performance specifications of labeled CFLs requires ignition within 1 second (many are even better), and full run-up (100% light output) within 3 minutes. It's the run-up that tends to bother folks, especially in a room where the light is only used for short periods, such as a closet. It just seems too dim at first.
The minimum lifetime of an Energy Star-labeled CFL is 6000 hours (5.5 years if used on average 3 hours a day), but you can get 8000 and 10,000 hour rated ones too (those are more useful in places where lights are on a lot each day).
Also, if you get a bum one, Energy Star requires a minimum one year manufacturer warranty, so you're covered in that period.
For those in the EU, the EU Code of Conduct-labeled CFLs are the best, and are also covered by warranty. The specifications in some areas (efficiency) are stronger than Energy Star, but Energy Star has the most stringent requirement for lifetime testing and durability.
And remember, never ever throw out a CFL or fluorescent lamp into the trash! They both contain mercury, which is recovered if you take it to a recycling center (many hardware stores here recycle CFLs for you).