Closed air-cooling system that takes in outside air to cool bulbs, sealed to prevent odor leaks, COMPLETELY separate from room exhaust and cooling system, with insulated ducting.

Ducted air conditioning.

Best bulbs you can find. Hortis ftw.

CO2 on a true environmental controller.

Purchased clones from a clone supplier to dedicate your energy to flowering perfectly, or a large and clean cloning facility where you can keep mothers large enough to stock your whole grow.

A grow style that you, the grower, are comfortable with.

A type of fertilizer system that you like. Mmmm....(shameless plug) Canna Bio system, right down to the LIVE soil that smells like the forest floor after a rain. I assume you are a coop/caregiver? Fully organic grows are highly regarded in the medical community.

And most important of all: A head full of learnin'.