read an scientific article about LED's and their light spectrums a few things I read that surprised me - we all know that the "red" spectrum in led's increase stem elongation - now the blue spectrum - promotes plants compactness and root growth and if use only "blue" spectrum> The research states :lighting plant with blue light alone for the final 72 hours will increase terpene concentrations and also budflower aroma. If one has a dimmimable LED reduce to 50% this elimmtes brightness while increassing the blue spectrum