Hey, so if you grow autos id definitely go with the 1/4, 1/2 strength, and with the photoperiod plants if you're using good soil that will have nutrients in it then i wouldn't use any at first and then come in at 1/2 strength or if you waited about 3 weeks for the soil to deplete you could go by the makers recommendations. But I think the idea is its much easier to fix a deficiency than to undo a toxicity. ✌️