I'm considering 2 different lighting options for a 4x2x4 tent. First, a standard 400 watt HPS. Second, a 4-bulb 4-foot TT-105 (420 watts total) flourescent. I plan on using 4-inch in-line fans for ventilation. Which lighting setup would be best for this tent? Would the 400w HPS be too much for this area? Heat is probably my main concern. Thanks in advance, folks.