Quantum Boards. Wiring should be easy in series. They come with heat sinks and 4x QB132's would veg and flower perfectly in the 4x2x5. Then you're going to get more coverage over the canopy because the light isn't so focused like cobshop/rapidled style fixtures. Even at 40 watts per square foot you would-be
If not quantum boards then I would suggest Bridgelux EB2 lights.
http://ledgardener.com/diy-led-strip-build-designs-samsung-bridgelux/
Go down to your tent size, bridgelux build and choose between 1ft or 2ft strips. I just got done building his 4ft 4x4 build for 480 watts. It wasn't hard to do and the wiring was easy. It was tedious but for how much I spent I feel it was worth it for the canopy coverage I'll be getting.