This appears to be an article written as a student project.

http://footprint.mit.edu/energy/apres.html

However if you'll scroll down you'll see an interesting table, with
more than just luments per watt. It also includes dollars per lumen
and lifetime numbers. I didn't see the reference.

There is an interesting one liner at the end, giving lumens per watt
of a laser at about 700. Dunno where that data came from.