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how many plants can I fit under a 400 watt hps, where I'm using 5 gallon containers and keeping the light about 12 to 14 inches away from the tops?

I want fresh air intake from outside. Problem is that where I am, it can get to -30. Don't think plants would like that! How does one remedy that? Some kind of in line heater or something?

Mistakes I made this grow. 1. Having lights too far above plants. 2. Listening to someone that said the lights should be 3 feet above the plants.3. getting spider mites.3. using detergent(with micro-scrubbers) and neem, to kill mites).4 Using miracle grow fertilizer on really stressed plants and...

I have discovered that my lights were too high in flower. I am using 400 watt hps. I have lowered the lights to 18 in above plant tops. These are un-cooled reflectors. Will this correct the slow flower problems I have? The growth in flower was delayed. I had them way high.