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I use two 50 watt leds in veg, and dimmable 600 hps in flower.but only use 400 watts

i think u would benefit greatly from turning your hps up all the way up. U have good looking plants and u seem to take good care of them, but i would say more light would definitely help them grow bigger, faster and to their full potential! Thats my thoughts on it, but free advice is worth what u pay for it ;) happy growing