this is my 2nd grow and let these nl x shiva veg longer than the 1st time. the problem is 1 is now over 6 ft tall and only about 6 inch from my 250 hps bulb!! the leaves are burnt and dried out at least 3 inch from top down. its been 3 and a half wks since i put in flower.would it be ok to top 6 inch off the tops at this late stage or will it do worse than near the light? any input appreciated cheers