The distance between light and small plants

With a 600w led. Id say keep 30in light to plant on distance and if you have dim control start a 30% and as the month passes Increase by 10%each week just be sure to keep an eye out for light stress make sure you plant is acceptable to the intensity increases..*now shell seem like its taking life out of here as light does intensity but be not worried its just how she reacts at first..but light bleaching,or burn is what your looking out for..good luck ..hope i could somewhat answer your question.