Hey there,
You can flower with any amount of light.
The difference will be in the size and weight of your buds.
More light=more penetration=more bud.
Rule of thumb is 50watts per square feet but not limited to that.

QB
QueBud Reviewed by QueBud on . flower with fluoros? can u flower with fluoros? if so, how many lumens would u need? i am vegging my 1 plant with 7800 lumens o fluoros in about 3 sq feet if grow room, could i flower with that? i am planning on adding 5200 more lumens, 2 more lights. my computer is stupid right now... ill add some pics soon. Rating: 5