You can find LED bulb and Classic incandescent light bulb efficiency comparison in the table below. The values in table are approximate, because there are many companies focused on bulb production and also the technology is improving. Brightness is measured in lumens.
The comparison between LED bulb and Classic light bulb wattage is usually explained on the bulb box, so you can compare it when shopping.
|Lumens||LED bulb||Classic bulb|
|800 lm||8 watts||60 watts|
|1000 lm||9 watts||75 watts|
|1600 lm||13 watts||100 watts|
|2000 lm||18 watts||120 watts|
|2500 lm||20 watts||150 watts|