Thanks earthy for filling in the gaps for me Firstly the temps are now around 82-86 with the lights on and 76-78 with the lights off. The tent is a growlush prop/veg tent and around the size you listed. Everyone at my local hydro shop said i wouldnt be able to run a 400w hps in a prop tent but hey the proof is in the pudding. Althought my plants are about 3-4 weeks old and are only up to the 3rd or 4th node so im not sure what the go is.

Peace