Interesting comparison of HPS with CFL

[leafminer]

I was looking for info on lighting systems like my own - I have a 150HPS and looking to add 4 x 42W CFL - and came across this:
http://www.rollitup.org/indoor-growing/83378-16k-lumens-hps-vs-cfl.html
The neat thing is the graphics that show so clearly the distribution of lumens across the space. I'm using a 150 HPS with about 0.75 sq m which is working pretty well.