Pretty sure OP is talking about a board similar to
this but 4 of them on 1 heatsink.
Hydrokid attempted to google sunboard and came up with the strips.
There is about a 5-10% efficiency difference between the LM561C diodes on the strips and the LM301B diodes on the boards, although the same seller has LM301 strips as well.
I run the 3500K strips from this seller because I bought when I knew less 6 months ago. I originally used 4 of the LM561C strips to create a square around my viparspectra white light in my 3x3 tent and that worked like a charm 150watts each for a total of 300watts. I have since upgraded to a 4x4(really a 4x8 but only use half) and the great thing about the strips is you can buy new angled aluminum and/or drivers and easily "upgrade" them. I went from 8 strips in the 3x3 to currently 12 strips in the 4x4 pushing 480watts. Ill have a grow diary next run in about a month or so. With running out of room in the 3x3 with 5 plants and switching nutrients, I'm a bit embarrassed on the looks of my plants now this is only my second run.
There was another seller "High_Lighting" on ebay that was selling the LM561C strips with a heatsink for about $16.50 each, which is where I picked up more. Currently hoping that the ARROW strips drop back down to $2 and I'll grab a bunch of those for the other half of my tent. Definitely like the strips vs the vipar light which is just a board.
To answer the original question of thoughts on 4 boards that the OP had asked - Look at reviews and search for this light in this forum as it is essentially what you are looking at. Should veg a 6x6 and bloom a 5x5
High Efficiency Commercial Indoor Horticulture LED grow light designed to replace a 1000watt HID with just 490 Watts. 1522 PPF @ 2.55 PPF/W. Full-spectrum. Reliable passive-cooled design. Powered by Samsung LM301H LED and Deep Red LED 660nm
horticulturelightinggroup.com