The daylight bulbs do use less energy which supposedly helps save the power plants from generating as much and dumping more mercury into the air and water. They have their uses but they are kind of unpleasnat if you try to use them all over the house, and if you break one, it is a problem. They are more expensive upfront to buy and make oo, there are all sorts of considerations that's a fact.

what I find interesting though is that while mercury thermometors have been being phased out as dangerous, they put a stamp of approval on these lightblulbs. Maybe they just wanted to collect all the mercury thermometors so they could recycle the mercury for other uses.