reflector

Some of my corals have been struggling and I finally decided to get one of the Apogee 510 PAR meters from BRS and see if lighting might be my issue. I have two Kessil A360X's on a fairly small tank so I've always assumed that I probably had plenty of PAR. Turns out, I had way too much, and...

Hey guys. I’m trying to choose an LED optic / reflector for my DIY LED. I’m building a DIY LED as some of you may have seen, usinf 25x Cree X-Lamps and some Luxeons. I was planning on using one of the cheaper ebay 44mm reflector / optic combos, but are these actually any good? Otherwise, what...