If in soil you picked the wrong department but we will try and help
If Hydro then it depends on how fast they have been growing??
How far from your flowering height are you??
How long did you plan on vegging??
Clone or seed??
Without knowing any of that I would say either cut nutes in half, move light further away and pray to the ganja gods. Other alternative would be to put them into flower or previous recomendations.:thumbsup: