Morning mate, thank you for your input and for suggesting a chat with "forest". It is always a good idea to have a good chair to go with the literature, sometimes I just sit on a chair and look at my garden, the plants can tell you so much about what is going on if you know what you are looking at. The Jorge Cervantes book that I mentioned tells you the affect that nutrient deficiencies and heat or humidity issues will have on the leaves of the plants. If you can learn how to "read" your plants then you will learn what adjustments and changes you should be making now to see results for your actions in a weeks time.
What does the "build quality" of the Lumatek feel like, is it rigid or does it feel flexible? And is it a metal framework or some sort of plastic/nylon? Do you know the weightof the unit (don't worry if you don't it should be easy to find)?
I like the 1000w ballast I have of theirs it feels solid, sturdy and well constructed with good quality components it does not feel like the output selection dial will pull or snap off.
So, I have just been outside to take a quick look at things whilst waiting for the kettle to boil. After the error yesterday evening I ran both the intake and extraction fans throughout the light and had a temperature of 35C this morning. I have given them a "half feed" with a diluted nutrient solution and will continue to do this twice every 24 hours whilst I combat the heat and humidity issue instead of one large feed in the late afternoon as I had been. 35C does not concern me to much because I have grown and harvested during summer months with that temperature but I would like to get it down and have more control over the temperature. If push comes to shove and I feel that the higher temperature is a concern and is detrimental to the end result I can always turn off one of the lights and reposition the other two so that they can properly cover the area.