the bacteria & such don't need light.
if you have corals on your LR, it depends on the type on how long they'd be ok without light & be able to recover.
No corals or fish. Going to wait and see if the tank goes through a cycle or if anything leaches from the LR.
As far as lights go, Should I go with 90 or 60 degree optics? I don't want to go with 120 because of the depth of the tank but I'm not sure if 60 would be to much of a direct light vs the 90.