Yeah I am looking for something along those lines. Ideally I want something cool enough that the plants can touch it without issues. The space is only 18"wx28"dx72"h, and the plants can easily fill that floor space. Think of it sort of like a vertical scrog with an intense top light.
Its just that using a full sun board or whatever on each side and then have a light on top would add up to a silly amount of wattage for the space. I was considering a very high efficacy 24V tape light to surround the plants. I have seen some that claim 150-160lm/w and they have them in a variety of spectra. Those boards you link to look good too, but can I get them close to the plant?