Not much info to go on here - but from what I see, reflective material would be cheap and easy to add. Do you have any air movement? What are the temps? Provide some details and it will help guide the advice!
temps dont get over 80 degrees and they get lower than 65 at night. i have a total of 4 fans running. as for reflective matrerial what would u reccomend? i had a few foil sheet in there but they fell off during veg so i threw it away, also its too late to add now because my grow room is full but i could do it next time. im running a 400w hps, fox farm soil, 5 gal buckets, nirvanna nutrients wk 3-6, 4 fans like i mentioned. i dont have anything to measure humidity but i would assume its under controll. i water every other morning with 2 liters per plant, 2 larry og kush feminized seeds, 1 bubba kush clone, 1 hawiaan sativa feminized seed. plants are at 21 days of flowering today. just starting to develop trichomes, however a top on my bubba kush is already starting to show signs of orange hairs, is that normal for this early? i know bubba kush is a 8-9 week flower time. i guess it could just be from the other leaves rubbing on.. anyways thanks for the input.