Lights help needed

Watts are a bad metric to use, as they are not always apples to apples between 2 different lights. umol/s is a better way to go to draw comparisons and determine what is the best option. Efficacy is why watts differ.. also, why it can often be cheaper to buy a more expensive light over the 5 years of use. I'll just suggest the total amount of umol/s you want to shoot for, relative to context. Photoperiods.. Any combination of lights that adds up to 2400umol/s give or take.. preferably err on high side, of course. The more evenly distributed the better. The more efficient the lights, the fewer the watts needed. A mid-to-upper range quality light can probably do this at 2x 480w lights. Cheap lights will need a bit more than 960w, if you want to max out with ambient conditions. Or, mish-mash what equipment you have to reach this 2400umol/s ballpark goal and spread them out as best you can. If you boost co2, control temperture and RH, then i'd suggest 2x 650w lights with high efficacy. About 3800+ umol/s needed.. and in this case much more probably won't help.. i'd just let the available equipment decide. You'll want a 2.8-2.9umol/J light and those aren't cheap, but in this context you've also spent a lot on ac/heating,dehum, humidifier etc etc.. lol, so don't skimp here! Autoflowers -- take the umol/s from above over 12 hours and multiple by 66%, since it will run 18hours... if you run longer light cycle (X hours), adjust factor percentage. (12/X * 100 = %) e.g. 20 hours of use would be 60% of the above. it is all relative (amounts to DLI, reference a DLI tabel and you see my suggestions are all in proportion). If buying new, also prefer a bar/led strip style light. consider DIY. simple angled aluminum does well enough for a heat sink and frame if watts per diode are roughly 0.4w/diode or less. a few hundredths off not being too important.

I would run 2 480 watt or 4 240 watt leds in that space. My grow space is about that big and I have 4 240w quantum boards. I prefer the 240 over the 480 because I can space them out better for more coverage. I love samsung lm301 diodes and meanwell drivers. They produce nice buds and are about the most efficient diode you can get.

I would go with 2 with a minimum 400watt pull from wall each.

It all depends on the power of light you want. A p2000 for instance c9vers 120x60 that's 4x2 so by right you'll need 2 200watt viparspectra p2000 sf-2000 TS-2000. Buying 1 400 watt wouldn't cover that much. Have a look at lights like that gives you the option to have different levels for dif strains as no plant grows the same. Good luck.

well for a tent half the size i use a mars hydro fce4800 so two of them would be ideal for you but its upto you telos is another really good option you will need two of a powerful light though if you wanna pull of some good yields led lights you get what you pay for and light is a very important part of growing :) hope this helps miss