Energy Star estimates that you will save $30 in energy costs for every incandescent bulb you replace with a CFL.
Because of this, consumers can buy a 15-watt compact fluorescent bulb to generate the same amount of light as a 60-watt incandescent bulb.
Even then, it wasn't that practical, mostly due to its high cost and limited availability, and people still favored the incandescent bulb for their lighting needs.
Not only were these bulbs expensive, but they emitted a harsh blue-white light that was not very inviting as people were used to the warm, yellow-white light emitted by the incandescent bulb.
One nine watt LED bulb gives off as much light as a 70 watt incandescent bulb.