Light, heat or nute burn...?

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So, I have this Dos Si Dos from Barney's Farm, currently at day 49. Recently the tips of some leaves got brown-ish and crispy, bud formation is unusually slow and I'm not sure about the cause. It can be the light too close, she got pretty tall for my closet, I had to tie her a bit here and there to keep away from light, but doesn't seem to help.
I'm unable to raise the lights more, I could only switch to a less powerful one if that helps. But in my (not much) experience, it also can be nute burn.
I'm using Plagron Lightmix soil with Plagron Bloom Nutrients, feeding and watering in 5-7 days. There's an 500W full spectrum COB LED some 20 cm over her (photo attached, it's a pretty simple and cheap one).
What do the experts say on this one?

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First off LEDs do not burn plants unless they physically touch them. Diagnostic pictures need to be taken in daylight 5000K with the grow lights turned off. I cannot tell for sure but I would say that is tip burn and you are overfeeeding the plant and the nutrients may be out of balance. You might be headed for a full lock-out. Take a look at this thread to see if it might help:


:goodluck:
 
First off LEDs do not burn plants unless they physically touch them. Diagnostic pictures need to be taken in daylight 5000K with the grow lights turned off. I cannot tell for sure but I would say that is tip burn and you are overfeeeding the plant and the nutrients may be out of balance. You might be headed for a full lock-out. Take a look at this thread to see if it might help:


:goodluck:

Thanks for the reply! I will look into it for sure and the girl goes for some fasting!
 
First off LEDs do not burn plants unless they physically touch them. Diagnostic pictures need to be taken in daylight 5000K with the grow lights turned off. I cannot tell for sure but I would say that is tip burn and you are overfeeeding the plant and the nutrients may be out of balance. You might be headed for a full lock-out. Take a look at this thread to see if it might help:


:goodluck:

Indeed it most likely a nutes lockout, so a I flushed the girl, we'll see what happens, thanks again for the advice, this one I didn't encounter yet.
 
Indeed it most likely a nutes lockout, so a I flushed the girl, we'll see what happens, thanks again for the advice, this one I didn't encounter yet.
Oh wow! I almost never recommend to flush as it often causes more problems than it solves?
 
Oh wow! I almost never recommend to flush as it often causes more problems than it solves?

Well I searched a lot about solutions and it seemed like a good to go option. Indeed the water coming out looked to be discolored due to excess nutrients. In a few days I'll know more and update! The plant definitely doesn't look worse after 12 hrs, I'd guess it's a good sign :)
 
How is your pH?

I had issues last grow where I wasnt check pH as well as I should have and had similar (worse) issues. The buds still formed, super slowly but the sugar leaves dried out. It made for a difficult cure and a harsh smoke.
 
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