Ok - so I didn’t plan to do this today but I was transplanting the last 2 seedlings and putting them in the tent and I decided to try the underlighting now and see !
This was supposed to be a 6 plant auto grow using Nectar for the Gods nutes for the first time and grew into an 8 plant auto (all different strains) in all coco and NFTG but added underlighting after seeing some pics of results from others.
After this grow I will have some better idea of what underlighting can do in my situation. I only have a 4x4 tent and because I was worried that a couple of seedlings weren’t going to make it I ended up with 8 Autos in the tent (1 ILGM Amnesia, 1 MSNL GDP, and from Mephisto Genetics all autos - Samsquanch, Chemdogging, Cosmic Queen, Double Grape, 4-assed Monkey and Sour Stomper a specialized auto breeder)
This is a less sophisticated setup but meant to test the method.
I just ordered some more 10" saucers to make it a little easier to circle the light (now there are half 12") and I have more work to do on the auto drain to waste setup (keep getting leaks in my DIY project). But overall the girls seem happy. They are 4 different ages from 30-60 days from popping so I should be able to see what happens over the time.