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There are no lenses on Grobeams. Aquarays is different product made for Marine. Whatever it was with lenses or not is pointless as they are not sold or marketed for planted tanks today.
By the way did anybody notice TGM news?
http://www.thegreenmachineonline.com/ar ... d-lighting
Not sure what...
Marine version is probably narrow focused while Tropical should have 120 degree spread. That's why I am using 2 stripes to cover wider area but I will test later with one stripe positioned few inches higher.
I am using 2 Grobeam 500 each rated 12W as you know. TMC claiming it is more than 24W of T5 but LED have higher usable PAR than T5 as well. I am down from 2x 100% intensity to 2x 50% as it was too much light on my 60x35x37.5 tank.
I could be maybe fine with just one stripe on this tank. I am...
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