I think you're on the right tack in shooting for the right PAR in the middle of the tank. I have the MaxSpect unit, and I think the 30 watt LED's with the right optics might work. They have 15 watt LED's also. They are multi-chip LED's and not the single chips that Mr Wilson is speaking of. Those must be pretty powerful and I'm very interested to hear what he has to say about them after he gets them. The only problem with the 15watt and 30 watt LED's paired with optics is the price. You have a pretty big tank, and to get good light coverage, you would need to buy a lot. I'm sure you've looked at all those LED canons, like the Ecoxotic, I'm not sure if those would work, but again those are pretty pricey. If the initial cost isn't too big of a problem for you (you'll quickly make up for those costs with the big savings you'll get in power consumption, the cost of a chiller and the huge amonut of power they consume, and buying replacement bulbs), I think there are a few decent options for you, but I would definitely wait to hear what Mr Wilson says about the powerful single chip LED's he's getting soon, because I know what a 30watt multi-chip can do, so a 100watt single chip must be dangerously intense, in a good way (I only mean dangerous to your eyes, don't look directly into a 100watt single chip, let alone a 300watt single. It might rip your retina, seriously, I don't know for sure, but it might. I only know what a 30watt multi-chip is like and that is bad enough.). I follow Mr Wilson's thread so I'm really looking forward to what he has to say and seeing what what these single-chip LED's can do.
Ching, I'm sorry for going off topic in your thread, it's just the talk of these powerful single-chip LED's that Mr Wilson is getting is really exciting to me. I kind of feel like I'm committing a sin by going off topic in your thread, because to me, this thread, and your tank, is pretty much sacred. Your tank is beyond incredible and this thread only reaffirms that.