Leaf tips burnt

Your feed is causing the tips to burn, not the light, reduce feed strength

I follow the general hydroponic sage to a half. Input 550 ppm output 650ppm. I think its light burn The heads are less than 20 cm to the led...

Put your 120 back, you're going to stress the plant; lower the light... I would lean more towards an excess of nutrients, you need to know what you gave it... or at worst, flush and wait for the flowering to feed during the stretch... let it recover well from this excess and test your pH, it could be that too. To be on top, buy an EC tester. See you!

The yellow color is the reflect of the flowering spectrum ... They all dark green I turned to 12 12 to minimize the strech , im already at 18 cm from the led..... would n t it help ?

This is not light burn - and I'm wondering why you've got them on only 12 hours of light a day! I'd not only put your intensity back up but would also tell you to increase to 18/6 at the bare minimum! What I would also suggest is that you check the PH of your runoff... the coloring looks to me like you have an imbalance there that needs to be corrected. It should be between 6.0 and 6.5 so your plant is able to absorb the nute and micronutes it needs. And now that you're in flowering, you can start to back off on the grow nutes as they provide more nitrogen than is needed at this stage... Good luck!

It is burning from too much feeding, not light burn. Go back to 120w, your plant needs all the light she can get during flowering.

Hey there Ganjafarmer, seems like a magnesium issue because of how the yellowing is going . but honestly there's just light burn on the tips. just reduce you feed by 0.2 mL/L on each and it should basically be the optimal for your specific plant. normally if you do this the problem will stop spreading and you'll cruise through flowering. Hope this helps ! 🚀

I agree with herbaledu on this one. Make sure every other feed is just ph water to clear away some of the salts.

Thoose are neglectable burn imho, you shouldn't bother much about it as it happen pretty often such burn/deficiency don't spread more than that as flowering goes. You don't want to reduce the light intensti in flowering, keep 120W at 20 30cm on and you should be fine., 120w isn't much anyway. Happy growing