I run a 4x5 grow tent , 2 400w hid , 220 Cali works solar flare , and a 50w led , I put mine straight under the 400 hid and leds , now for the first 3 days I kept my lights high roughly 3 foot LEDs can be lil closer , then I lowered down to 18 inchs and there 22 days today and showed sex ... So if u keep ur heat down which my light at 3 foot high was puttin heat off at bout 77 degrees when I got it down to 18-19inchs I'm hitin 80-81 . My autos took fine to the light ... My oppion I like keepin my lights higher then most , I like to allow a small stretch over just plus bush , first pic is like day 5 to 7 or something like that , then the next is day 22 ... Idk if uve messed with autos but there will be small slow growth till that tap hits the bottom then just crazy noticable growth each day .