As Marty said... LEDs vary GREATLY depending on who makes them.
Just look at the difference in LED flashlights. Some are not better or worse than an old time bulb... where others are bright as all get out.
It addition to the light output... they can vary greatly also in the heat they generate. The one cheap LED flashlight I have is REAL bright, but it gets so hot you cant even hold it. I use it on my bike handlebars only because of this.