i'd start out slow and add alil at a time i went from veg to 12/12 i changed out my nutes from around 500 i took it to 750/800 then after about 2 to 3 weeks i went to1200 over the 3week time span and i never got any burn or anything like that but depends on ur plants too i would'nt go from say 500 to 1000 but over time work it up to that