I have never even grown a plant with less than 24 hours of light well over three hundred autos so far of all different strains and seed comapnies. They took the best part of the RUDY strain the auto factor rudirelas has a 2 month window to get to maturity and produce seed stock to keep going they do it under 24 hours of light. So with that in mind treat your plant like a rudirelas it will give you huge ass plants sugar coated YAHOO