I've got the 16" box over my 60 cube with the mounting brackets, about 9" above the tank. All softies and a coupe BTA's. I run mine t 20% whites and 70% blues, started low of course. I've had mine since January. I do prefer T5s, but overall I love the light and spectrum it puts out. I did have a couple shrooms that just didn't acclimate well,but everything else is thriving. They also have a support group on FB as well.
I have had diatoms for a few months now that I can't get rid of. I attribute that to the LEDs as I've never had the issue before, but oh well. Overall excellent light and much better spectrum than all the other black boxes and a few of the name brand LEDs.