I have been running these white widow under cree cob at 62% from my understanding.. heat is never over 82 . And humidity is always around 65. Just wondering why they are so bushy and no stretching at all lol first time using cobs and i am running 12 of them about 3.5-4ft away. Maybe turn them down? I can give you guys the lux at canopy if that helps. Thanks !!