We have switched over as the old bulbs burnt out. I just don't think they put out as much light as the older bulbs do. Might just be us, be my wife and I think their is a difference.
At my house we turn off the lights when we leave the room. During the day, open the curtains. We turn off our electronics when not in use. We are conservative in the truest form.
They can. They can be so bright that it's dangerous.