What the light situation comes down to is 35 watts per square foot to vegetate, 50 watts per square foot to flower. And those have to be real watts drawn from the wall that you have to pay for, not some marketing BS like calling something 1000 watts or 2000 watts when it is much much less.
So how much weed do you really want to grow? Having plenty of room doesn’t help if you only want to spend a few hundred on lights and not much for electricity. People manage to get by for personal use with a 3’ x 3’ tent and 450 real watts of light, or even a little smaller with a 400 watt HPS bulb. I just did that and got about 7 ounces of dry NL buds. More experienced people using better nutes, medium, and LST get even more. (I know medicine, biology, programming, and electronics, but am a real newbie at growing weed.)
So first think about how much weed you need about every six months. Then plan your tent, chamber, big cardboard box, or whatever to grow that much. (I got 7 ounces in 7 square feet.) It’s important not to make it too big, because then you need more lights and have a higher electric bill. I see you already have a big tent, so you can shrink the plant area using big sheets of cardboard painted white.
Then get lights, enough to have 50 watts per square foot and REAL watts. That will heat up your tent even if they are LEDs or COBs, so you need a exhaust fan at the top to get rid of that. It looks like you have that.