SupraSPL
Well-Known Member
Depending on the cost, this might become the lowest hanging fruit at some point in the near future
http://www.ledjournal.com/main/blogs/examples-of-optimizing-lighting-efficiency-with-glass/
http://www.laserfocusworld.com/articles/2014/02/antireflective-coating-increases-led-lumen-output-up-to-8.html
https://www.guardian.com/cs/groups/guardiandotcom/documents/native/pro_017379.pdf
http://www.ledjournal.com/main/blogs/examples-of-optimizing-lighting-efficiency-with-glass/
http://www.laserfocusworld.com/articles/2014/02/antireflective-coating-increases-led-lumen-output-up-to-8.html
https://www.guardian.com/cs/groups/guardiandotcom/documents/native/pro_017379.pdf