Yeah, you need more, 30-35 watts/square foot is common with good white lights. Cool air temp will slow growth and more watts will raise the air temp, 27-29 is good with LED. And look into VPD.They are in a 3.5x3.5 air temp is between 23-25 C and Rh is between 50-55% humidity has been a bitch to control in a bigger tent and a cheap exhaust fan
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