I would say that it is a strong light for a 40x40 tent. The spread is very good because the light is a little over 30cmx30cm. So every leave got it ppm.
It fits in a 40x40cm tent very good. But the problem is that there is no more space for the air circulation fan and dehumidifyer or hygrometer. So for adjusting the distance to plant you also have to adjust the other things in the tent.
I didnt read the manual... so i startet with 100% since the first day. A desciption on the bord itself which percentage in which phase is optimum would had helped for me as a beginner.
Nevertheless it is a great light. Easy handling.
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8 months ago