I built one.
plan it carefully and thoughtfully, otherwise it becomes one more chore.
My first one is not that great but the one I put up a couple of days ago should be much better.
It sits on top of the tank and drains straight in via couple of bubble bafles. LED are arduino controlled. The whole thing is mirror acrylic on the outside with the mirror finish inside so it spills little to no light. The internal clear acrylic dividers shield the LEDs from water or spray or anything else. It's the same height as my hood so if I get to painting the edges it will not be even noticeable, the only thing that gives it away at this time is the light spill.
In less than a week it started growing algae already, nothing spectacular but it seems to mature way faster than the previous one.