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What pot size is optimal for 150w hps ? If growing in soil. In grow space around 2x2x4.

Greeting's everyone! Soon i want a buy a new 150w hps grow equipment and I want to know how much CFM's do i need too cool down the bulb? My grow space is 56x58x125cm help me please. Im also going to use 30cm cooltube. Could 100 cfm extract fan work for this matter? Later perhaps I will...