30 R/H is ok but any lower & There's no moisture in the air so the bud will dry & Loose weight, Potency etc.. 40 R/H would be better & I bet if you put your hand in the grow space you will have hot pockets of hot air/hot spots in the grow room & Even if it's right at the top it will have a major effect. Raising the light 20/30 cm's could help or bend shades away from the bulb a bit if it's HPS ?? I blow a fan straight onto the bulb try that & It'll gain you 5/10 R/H it did for me '-' Lack of Cal-Mag (Brown spots on leaves) Lack of Iron (New top growth yellowing) Lack of Magnesium for photosynthesis especially !! Not using your nutrients at the full recommended dose can also cause this, If they don't have the correct nutrient ratios they can't keep up with photosynthesis from the heavy amounts of fake light we dish out & It runs the plants down depleting their energy but honestly ?? I'm guessing you have the light a little close ?? Or the air flows knotted just buy & Throw in a bag of Co2 (£5 eBay last for 3 month) & You'll easily run 79f+ but till then Datboyct580's dead right I'd back right of the temperatures or next thing they'll be drained yellow with no smell & It can't be won back !! Good luck & A long comment I know !! But I'm only trying to pass on what I've learned (The hard way) over the years. Products like Alg i Mic, SuperThrive, Vitalink Chill, Velo Kelp even Seaweed & Hydrogen Peroxide can all help in these situations & Silicon for the protective layer hurts none but why pay for all that when you can bung in a Co2 bag for a £5er '-'
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