I'm not claiming my setup is ideal, but as a point of reference I'm running 900W in front of a 4x6' trellis panel and it's bordering on too much light.
I'm running 4 modules over each trellis. Each module consists of two pairs of CXB3590 72V 3500K chips under 80 degree KB glad lenses, driven by a Meanwell HLG 185H C700B. This gives each chip 50W, plus I run the dimming leads open which then gives an 8% boost for 54W apiece. With the driver, it pulls 225W at the wall. Each 4 chip module was meant to cover 6 sq ft, but could easily do 8.
Honestly, I think this same configuration would work just as well over your 4x8' table without a lot of modification... but I'm not suggesting you duplicate my work.
Why not? This design was finalised some 16 months ago and I've been running it for nearly a year now. Since then, COB LED chips have gotten both better and a lot cheaper- not to mention the new quantum boards which are yet another step forward.
Time marches on, stuff keeps getting better/faster/cheaper. The need to validate it and find better ways to convert all that performance into yield is never ending.
I'm thinking a 2 wide by 4 panel long array of quantum boards driven at about 100W each would do some serious damage over your table. Each panel would be centered over its own 2x2 square, creating a very even and well spread out light distribution pattern.
@Stephenj37826 what do you think? Would 800W at system level over 32 sq ft be close to the 800 PPfD sweet spot? What drivers might you suggest to make this work?
There's a lot of 4x8 tables out there in commercial grows, after all...