hey there Jamaik, yes, i'm afraid there will be pretty serious consequences if the plants dont get any light at all during 7 days. it will mess with the development the plant might wilt and die, it could even be stunted. If you do anything to get light to them, that's a good idea, think about a car battery , powering some house lamps maybe. But you should do it asap, and as well as possible... just keep a nice steady "low intensity light" schedule on a regular timer for the duration, then switch back, it will really help. Hope this helps ! 🚀