I don't know about using less energy, but my experience is that they do not burn brighter and burn out at a much higher rate than the incandescent ones. Plus when they break they expose anyone in the area to a hazardous material - perhaps we'll soon have a regulation to call a hazmat team to clean up broken “green” bulbs.
We have returned 100% to the old fashioned bulbs.
This has been my experience, too. They burn out quickly. And the color of the light sux.