I'm possibly facing a similar issue too. The rapid led Corona I have been using are very good at directing light down into the tank. While there is "spill" outside, it's not bright to the eye, even at 14" mounting height. I'm looking at changing over to radion g5s, but at 8" it's ridiculously bright if I look over from the couch...Yup, been having the exact same thoughts. I was thinking about some kind of white PVC sheet just for the front.