How many?

I thought i was goin with 17 but im gonna go with 5 five bushes (00 seeds northern lights)...... So how many led watts do suggest over those?
 
You need a fixture every 2sq ft. Or 10 quantum boards or 4 xxl hoods or the sun.

Unless these are the 6 inch tall auto-twigs then 1 mv light. :-)
 
If you choose to go with COBs...

I this video I have 5 plants (AK48), under a 300watt, 6 × cob 3590 build (18in spacing), in aeroponic - aquaponics, and a total of a bit over 435grams, or 1.45gpw.

I recommend using double this in flower, @ about 1 cob per sqft.

 
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