Yeah we need more info. As others have said, that light is underpowered for your space. I'm running a MarsHydro TS3000W (the step up from yours) in a 4x4 and it's probably even a bit lower power than ideal for that size tent.
What's your temp and humidity look like throughout the day? I just had a harvest I basically binned and I'm pretty sure it's because my humidity was low and my temps were high. Got a better exhaust fan and set my humidistat higher, and the difference is night and day. Excited to harvest in two or three weeks.