I don't know what a green wall is but it looks badass.
green walls are awesome. If all goes as planned, we'll have one of these.
This one will be purely aesthetic. While it's possible we may try and throw some herbs in there, the overwhelming majority of herbs are high light plants. At best I'll have a skylight to sit under. This is why the "test" - this thing is actually in a totally dark hallway being hit with some $11 Amazon LEDs which I'm evaluating with a PAR meter. Unfortunately it's designed for golf courses so "2-50 PAR" is one LED. On the plus side, I can hit at least 2 PAR. On the minus side, more than 50 PAR (which is where you cease to be a "low light" plant) requires about 11W of LEDs to be less than two feet away from the plants, which will not look good.
This being the dry run version, you dump water in it. The big boy version has a pump and a recirculating tank. The reason I did the little version was to see what I thought of their method, since it's different than the whole Wooly Pocket approach. 3 weeks in I rather like it.