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That 6" vortex will be plenty for a cab with an air cooled light and a scrubber attached to it. Just make sure that the cab has plenty of cool fresh air available to it and you'll be set.
try 50% crushed whole grain oatmeal ,40organic soil , 10% worm castings , mix let sit two weeks mix again 50/50 with perlite ready to plant . never lost a plant with this mix, this mixx even works well with cfl. ps its really good at holding ph levels steady but u may need to level it out to start with based on what soil used , mostly u will need more acidic soil in which case add 8 bags of lemon herbal tea per gallon of mix