Cost for indoor grow

(roughly)how much would it cost each month to run a 6-8 plant hydro setup in southern california now-a-days

There is a sticky thread in this sub forum dedicated to this topic.

Depends on your lighting mostly. And ambient temps of the room.

I suppose you're talking about electricity costs? If so, what power output will you be having? (Lights & fans & AC)

do 3 plants and setup three 4x4 scrogs under 600 Watts a piece instead, and your looking at about 120 dollars/mo for max kush.