Great quality for the price, perfectly fitting a 80x80cm grow tent. Sweet spot distance is in my experience between 60cm and 40cm distance from canopy according to the plants needs. I felt the need of having more of a red spectrum for the entire blooming stage. With my setup during spring (room temp day 20/night 18 umidity ranging between 45% and 70% ) with lit lamp inside the tent 22°C RH 55%, lamp off 19-20°C RH 68%.
Excellent product, value for the money.
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