My set up is 2X4 with two 70 watt MH lights. Picture links.
I think it should work! Its bright.
How do you post small pictures
Here is a link that might be useful:
You can improve further by adding even more reflective surfaces, such as painting the board white. this is because the lenses look like they are flood lights, not spot lights.
thanks for the info. I just reposted with a picture. Topic "Up and going" I made the board white and I shaved 5 inches off each side to fit my grow tray. Thanks for all the info