@latewood Thanks for the reply. I ended up purchasing Quantum Boards offered by Horticultural Lighting Group. I purchased the QB304 board at $75 each .Board Level Efficacy with S6 Flux bin 2.61 µmol/J , 173Lm/W . Each board max out at 118w,with the driver I am using so with 4 I could have a 480w light. But I know that LEDs run better at about half wattage so I might running it at around 300-400w. I am running 2 boards in a series powered by a Mean Well HLG 240H-1050B driver which they recommended. This was a little cheaper than one big driver. So far I have $450 into this project. A little over budget. And I still need a frame and power plugs. The frame they use is a flat 1/8 inch thick aluminum plate which doubles as a heat sink. I could go that way but would add another $100 to the build or buy 4 pre drilled heat sinks at $8.75 each. As I type this I guess that is a no brainer . Then mount those to an aluminum angle frame which I have built before.
I have never wired one of these up before but they have pic on how to wire it so I hope everything works out. I will send you a pic when complete if I havent electrocuted myself LOL
I will be using the HLG 240H-c1050B driver but the wiring should be the same.
One more question. How do you determine your light spacing to optimize a blanket par coverage. That is par values that are near equal over the footprint area. Footprint area is 4 x 4.
Any other suggestions would be greatly appreciated.
Here is the web site for more information on these boards https://horticulturelightinggroup.com