CFL bulbs were introduced to replace incandescent bulbs, but were over shadowed by LED bulbs to become the new standard of lighting.
Old incandescent bulbs almost had same lighting power per watt (measured by Lumens), but with the introduction of LED lights, the lighting power per watt is no longer the same, and a better LED will render a higher (light) per Watt. Therefore, it became necessary, when comparing LED bulbs, to indicate how many Lumens each LED bulb is producing in addition to how many Watt it is using. So an A-19 LED bulb that uses 9 Watt and producing 806 Lumens of light is better than an 11Watt bulb that produces same amount of light (806 Lumens), because the later is using 12.22 % more power to produce the same amount of lighting.
Cnet, published a comparison chart to show the correlation between Watts and Lumens in both technologies. It must be noted that LED technology is continuously improving, so the chart values should be taken as an example only.