I hate to be a wet blanket here, I know everyone wants to be energy efficient and save money, myself included.
BUT, these bulbs (in my opinion) are a bad idea.
They contain mercury, 5mgs of mercury and that is nothing to sneeze at,espcially when you add up all the ones being thrown away and contaminating the earth.
What they do to the environment far outweighs the any energy savings.
Below is a blurb from a newsite and some links to back up my information.I am a mom of a mercury damaged child, please don't buy these, its not worth the risk.
Again, sorry to be a wet blanket, but I have to speak up.
Since then, the bulbs known as CFLs have bee
revamped, and strict government guidelines have alleviated most of those problems. But while the bulbs are extremely energy-efficient, one problem hasnt gone away: All CFLs contain mercury, a neurotoxin that can cause kidney and brain damage.
The amount is tiny about 5 milligrams, or barely enough to cover the tip of a pen but that is enough to contaminate up to 6,000 gallons of water beyond safe drinking levels, extrapolated from Stanford University research on mercury. Even the latest lamps promoted as low-mercury can contaminate more than 1,000 gallons of water beyond safe levels.
So, last month, the Prospect, Maine, resident went out and bought two dozen CFLs and began installing them in her home. One broke. A month later, her daughter's bedroom remains sealed off with plastic like the site of a hazardous materials accident, while Bridges works on a way to pay off a $2,000 estimate by a company specializing in environmentally sound cleanups of the mercury inside the bulb
http://www.wnd.com/news/article.asp?ARTICLE_ID=55213
http://www.businessandmedia.org/articles/2007/20071008
160623.aspx