The answer depends of course on how high your lights are so assume OP means as low as you can/dare get them. You could get a crazy flux density right next to the bulb where all the photons are concentrated
The figure I understand is over 1,500 micromoles per sq meter per second for 11 hours. Over that is fatal allegedly
500 umol/s/m2 will be min for basic flowering
Over 1000 is deminishing returns
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Gardro's coco grow mentored by joker the smoker
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