Here are some sativa/haze pictures all the same clone the shorter one was with the lights closer on the plants the taller with the light further away
I use bridgelux gen2 3000k by using a blue spectrum the first 3 weeks you will keep them shorter more compact
So i have a 15 strip 300w diy light from tose 15 strips there are 3 of a 5000k spectrum
Summary
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I use 7x7x18 cm
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