Hi i have a Juniper Bonsai, im not sure about specific type of juniper. But i live in a apartment where i get 0 hrs of sunlight on my porch due to a north facing porch. I have my plant under a full spectrum light 6-8 hours a day and have it outside the rest of the night i water it lightly every other day. What can i do to save my tree???

Your juniper is dead. And has been for a while. did you keep it inside? If the person who sold you this juniper told you to keep it inside, I would ask for my money back... because junipers will not survive inside, no matter how much anyone wishes it to be so.