Trees

Keep in mind while blurple works plants do use the entire spectrum. You should have at least one full spectrum light even if it's not your primary light by volume.

The absolute highest success I ever had in Hydroponics which is slightly different from aeroponics but not by much I just fully submerge the roots in water and use an air bubbler to keep them from drowning, but anyway the most success I ever had while testing a million different lighting setups was a full spectrum light above the plant with a string of blue up top at a very specific frequency that I found in multiple study papers but then most importantly strings of red at a very specific frequency that I found from those same papers on the bottom and through the middle of the plant.

When I added that red to the bottom and threw the middle I saw such an explosion of growth, mind you these were tomato plants primarily so there was a lot of plant to cover. But red light does not trigger the plants desire to grow towards the light because it's a shade response so running the strings of red right through the leaves of the plant meant all the middle and bottom leaves were not useless and it had access to way more energy than usual.

I tried the same thing with just blurple but it did not do quite as well, it still worked just fine and it definitely still worked better with the red light all around and through the bottom. But it definitely did better with the full spectrum lights up top. I'd say the amount of growth didn't change much with the full spectrum but the quality of the growth seemed higher if that makes sense