480w LED can do photoperiods in ambient co2. need a bit bigger if you want to supplementmore co2 with a tightly controlled environment.
480w over 18h is probably enough for autoflowers and boosted co2, though.
reference a daily light integral table. using umol/s, your area in m^2 and hours of operation you can get a rough estimate of your DLI. 35-40 dli for ambient co2 and maybe 50-60 for boosted.. depends a lot on the other factors to maximize the co2. These are good starting points that may need anothet 5-10% adjustment based on observing how the plant grows.