Well, then two of the chinese led
panels woudl do the trick then. SOmething like this:
Colorful Dimmable 120W LED Aquarium USA Warranty 13 Year eBay Seller | eBay
As far as the sump and plumbing, many people make their own sumps using tanks like a 55g one. You would have enough room for a large skimmer, refugium and anything else you would like to put in there.
A 40 breeder may work as well and its a bit smaller than the 55g.
I use a 1600gph return pump on my 6 foot 125g and I didnt make my sump for that one, lol, just bought a premade one. For flow I use 2 koralia powerheads at 1400gph each. I keep a 300 watt heater in the sump, not sure if it gets that cold where you are, I am in florida so I didnt need a massive heater. You would keep all your equipment in the sump which is awesome, keeps it hidden away and gives you a nice clean look in your tank.
is the tank drilled or does it have a hang on back overflow?