Leaves dying off during flower, problem?

Hi bro, The light intensity is too high. The plant is experiencing heat stress. Try to reduce the light intensity by using the switcher on the light set, if it's available. Alternatively, you can raise the lamp higher. Good luck, buddy.

Normally just a battle between how fast a plant can cool itself against light intensity. Possible it's just a little closer to light than it wanted to be, may exceed she got a little dry for a day, water got low one day, tips couldn't cool efficiently enough and crisp. Generally when specifically the tip is damaged then it's a conscious choice by the plant to do so as it will choose to sacrifice the least important part of leaf first when given the option. Nothing particularly wrong with a little crisp here and there we have our scars of life, just make sure it's not progessing. Start monitoring canopy temps make sure.she is not exceeding leaf surface temperature of 77, 85 with co2.

That looks like the grow I had that ended up being calcium deficient. First 3 weeks of flower with some strains have crazy calcium demands. Then it takes a bit of time for symptoms to show up and progress. That's what I would put my money on. My plan would be to reduce light output to slow damage. Hit plants with a moderate 1400-1500 ppm feeding that is heavy in calmag (i'd probably double dose it for first one to see if it helps solve issue) with a decent amount of runoff. (It may be over fed at 1800, some plants like that, some don't, especially if she's drinking fast, could leave a lot of salts behind and chug the water down causing a lockout, either way, dropping ec, and hitting with extra calcium and running that through the soil to flush out any build up should fix her up) See if problem slows down, or stops. If problem stops crank light back up and see if you're good to go. Kinda late to try to trouble shoot now as week 7 is a bit late in the game for many . Good luck though, I hope she turns around for you.

Light!

That's beyond senescence and some self-inflicted damage. Based on pattern of damage, I'd say this is light-related more so than diet. Vast majority of damage is only at the top. There are some smaller issues below that could be cleaned up but nothing too severe. May just need a slightly dialed back feeding regimen the last 4-5 weeks or maybe slightly less given leading up to those last 4-5 weeks.. a small adjustment of some sort can alleviate those problems. The light damage is a more difficult thing to assess. There are some benefits as long as it doesn't impact bud quality of your top cola. Stronger light will penetrate to deeper areas of canopy, which is a good thing. Those colas may ripen faster, but you can always chop them off a few days early, too. Bleaching of the colas is going way too far, but you may notice some less than optimal outcomes before that point too. Overexposed colas tend to have less flavor / harsher to smoke. Faster rate of evaporation of terpenes would be my best guess as to the cause along with any physical damage that might occur. So, consider raising light further or a little HST on the tallest colas. Plants look a bit too lush and i'd assume the symptoms below are more likely related to a toxicity than a deficiency based on how dark the leaves are and the curling/clawing shown. Would need to see the progression to give a better educated guess on the cause. If you have older pictures showing how the state of the plant changed over time, reference any leaf symptom chart and it's no different than anyone else's interpretation you'll get in 'grow questions' on this site or anywhere else