Those aluminum extrusions sure make a neat looking LED light. Beautiful job. Based on my data and on http://www.plantedtank.net/forums/di...-tank-led.html
I think you get about 40 micromols of PAR at the substrate, with 3 inches of substrate in the tank. That is a great light level to use.
I am very happy with this heat sink. It turned out much neater than I even imagined. And thank you for doing the PAR calculations to confirm that I have about the right level of light. That was one area I was uncertain about. I am planning to simply have the lights slightly raised from the top of the tank, but I did consider getting optics to raise it higher (I think this may be better for getting access into the tank). This project has been very entertaining, so any additional work will probably add to that (I hope).