That seems like a lot of potassium and phosphorus in relation to the percentage of nitrogen that it contains... for me, during veg, the best % percentage ratio is 1% nitrogen > 0.333% phosphorus > 0.666% potassium, and during flowering it is... 1% nitrogen > 1% phosphorus > 2% potassium. Then I completely cut the nitrogen out the last 3 weeks of feeding during flower, then the last 2 weeks before I harvest I only give them water. So, it would probably be okay for flowering if you add a potassium supplement, but I wouldn't use it for vegging!!!
Thanks fataqui. Im 3weeks into flowering right now and my middle aged plant and youngest plant seem to be doing okay. Id really only be using it for the oldest plant. Im pretty sure she sucked her soil dry of nutrients or just about. Mini fridge cfl grow box