If you want to know for sure if it is the light and you have your old one, Put it back in for a few days without adjusting anything else, if they perk up, you know you have a light problem.
But I tend to lean towards smashes thinking, they are finishing up, but they may have had a deficiency that got past you until now.
Also you were kind of vague on just how old the plants are. Weeks or days old helps give people a better perspective with Auto's.
I have not grown either of the strains you are growing, but Hijack & Autopounder breeder claims finish of 70-80 days, I tend to be skeptical of such early claims, but have seen a few plants blow through their growth cycle and yield an amount reasonable to expect from an average grower in 70 days