I have been replacing all of our bulbs with these. At first, it was a little expensive so I only did the ones we use often, but lately at my local Walmart, they are very affordable. I only have about 2 old bulbs left in my house. I bought a little meter that I hooked up in the cellar to just my lighting circuits, and I have noticed savings already. (Of course we don't use out lights the same every day, but it's enough savings to know that it's real) They don't burn nearly as hot either. (Although you still don't want to touch them) A great way to save money AND the environment!