I want to grow 4 or 5 auto flowers in a 4x4x8 space using a 400 watt full spectrum led light.Will this be enough light or do I need more.I also have a 6" intake and 6" exhaust fan.I have not built the room yet so it could be made smaller.It is also going to be in a detached shed so keeping enough heat in the room could also be an issue.I have been told the light would be ok just run it 24/7.Any input or suggestions would be greatly appreciated as I'm a newbie