my response will be quite ambiguous. because i know it to be true. i hated it when people told it to me
grow happy, healthy plants. cut your photoperiod to like 10 hours and see what happens
unlike nature, u have a closed system that gets "full sun" as soon as lights come on
it would be different if u had a dimmable fixture on a controller or timerd switches to control differnet banks of bulbs 12 hours of full sun is a lot
i run 9 and push the limit sometimes while adjusting c02 and trimming this and that
i had much better results honestly at 8.5 hours
i run 9
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