I like my 4x4 tent. I currently have 4 plants in mine. For light…please take a look at the HLG ones. For a 4x4 tent 2 HLG 260xl rspec light kits is perfect for that size of tent. Sure they will set you back vs cheaper quality of lights but 1 successful grow will pay for the lights.
I got 8 z’s dried and cured off my GSC Beast. You have to watch the cheaper priced lights because the watts they list is very misleading. If they say 1000 watts it maybe pull 150 true watts if you are lucky. Probably more like 100 which won’t really grow good and abundant crop.
Welcome to the community.