HELP! lightburn?!

[Mohsen228]

i got 50w full spectrum and 50w white led and its about 25cm away from leaves.
air circulation,ph,nutrients and soil moisture is fine
it could be lightburn?

 

[Mr.furley]

Pictures 1 and 2 look like it. Move your light to 40cm.
what brand of soil?

 

[Mohsen228]

i made it myself with cocopeat,perlite and composte.good brand soils are not available in here.i just added a little nitrite.what is wrong with third one?

 

[Mr.furley]

How much water do you give them and how often do you water? Do you have drainage holes?

It looks like a phosphorus deficiency but I'm not sure yet and wouldn't start there.

https://www.growweedeasy.com/phosphorus-deficiency-cannabis

Can you take a picture of #3 in nature light?