60cm x 3 1

Ciao AlienSCROG ! sorry I'm not italian, but i'll try to help ! so to calculate the amount of light you need : step 1 . calculate the area of the canopy (in usa square foot) then divide by 4 (4 sq.ft. per plant) Step 2 . multiply that number by 65 watts yep ! simple as that ! Step 3. divide that number by your light power. so for you : Step One : 4x4 (1.2meter square) =16 & 16/4 = 4 Step 2 . 4x65W = 260 Step 3 = 260/200 "actual watts" = 1.3 viparspectra 450... so some people use 50W per square foot instead of 65W... with 50W you get 4x50w = 200 actual watts = 1.0 viparspectra. So it's okay ! hope this helps my friend ! 🚀

you can for sure light stress a plant, but probably not with such an LED as the average sprectrum is neutral and the LUX seems..... check the lux, coverage is important so put them all in lol ... what color is the sun? what color are your lights?