so i had this grow going on in an old fridge in my room yadda yadda yadda enyways when the were about 2 monthes then i put it outside in the barn under a 600 w hps then they started droopping and showung sign of over fertilization burning of the leaves what is this and it is winter here so in the barn is -15 but in the litlle 4x4x4 room stays 25 degrees any opinionsa