S
sourpuss
Pretty sure cookies and cookie hybrids dont like large amounts of light. Although i never heard of em herming due to it. Gg4 has always had herm tendencies. Might wanna try some new strains imo.
Not saying it's not possible but I've never had that issue. My plants veg 18/6 under CFLs and get transplanted to the flower chamber under 600HPS 12/12 all in one day. In my recent crop the power was out on 3 different days and I had to run my flower chamber with 1 80W CFL for about 6 hours on those days and still no hermies. It could be that those genetics are particularly unstable and the change in light intensity is enough. If that's the case not sure I could work with them unless it's something amazing. As others have mentioned might be time to try some new strains? I hope you get it sorted quickly.Could it be caused by the large difference in light intensity going from T5s to Gavitas? I imagine the plants could have a stress response to such a large increase in light. Maybe try vegging with more light.