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I used 4x 4ft - 54w T5 bulbs Three of which were flowering spectrum and one which was grow spectrum as the plants benefit from having both. The...
That was from the 4 plants I flowered under lights, the ones I moved outside got eaten to hell, and didn't get a whole lot of light as it rained...
I used the 3 x 54 watt flowering bulbs with one "cool white" bulb on 20/4 and then in the last week I switched to 12/12 and after that left them...