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I found this http://www.ia.ucsb.edu/pa/display.aspx?pkey=3156 interesting and encouraging. We may yet see that high efficiency in a few more years.

Hi Folks, After much reading I decided to give building my own custom LED solution a go. I get really great light penetration with the HG 189-pro but since it uses 60 degree lenses coverage can be an issue. I have the 189 on a mover which really makes a difference but I wanted to take...