You don't need to be able to adjust DE stuff since they are centered already.
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I know you asked @jda, but if it were me I’d get the largest reflectors you can without getting larger than the tank itself. My chief complaint about the lumenbright minis are how narrow the spread is. They punch so deep but have a narrow light cone. As bad as a black box. Also the cayman sun mogul choice doesn’t have an adjustable socket. Meaning depending on your bulb choice you could get some goofy intensity distribution. Just something to think of.
If you decide to go with SE halides (instead of DE), I would highly recommend the large Lumen Brite reflectors (if you don't care about appearance). I doubt there is any reflector or pendant that will give as good a spread as those. Will give a pretty good, uniform spread over a 2' x 2' area. They are my favorites. (No glass though, in case that matters.)
You don't need to be able to adjust DE stuff since they are centered already.
I've used them both but prefer SE.I will take a look into those. Really liking the Hamilton Cabo system because of the large size. Do you prefer SE or DE?
I recently bought a 24" Cebu Sun 250W for a small cube tank. It is true that the bulb is not centered. It may not be so off=centered with a 400 but I think it will still be off a little. Some day I may look into moving the socket.The Cabo system has the adjustable bracket so I could move the bulb in case of size.
The Cebu system I was originally looking at had that problem where you cant move them to the middle.