I have decided to light my 77"L x 25"W x 57"H grow space with 2-600 watt hps for maximum light. I am assuming I will need air cooled reflectors and fans. I have heard that glass tubes will cool better but that glass enclosed reflectors produce a better light pattern. 1. Is this the maximum amount of light for this space? 2. What type of reflectors would you recommend? My venting is also complicated. No air conditioning. I have 45' of ducting to run with 6 turns. The first 25' can be any size, the last 20' needs to be 4" ducting. I have a 465 CFM ActiveAir Blower I can use, but I know it is not great for ducting. 3. What size ducting for the first 25'? 4. What type and how many additional fans will I need?