SOIL My buds top start yellowing

[3ms3eed]

My loved grower

2 of my girls are facing yellowing in the top part of the buds i don't have an idea about it.. please help light LEC 630 w, fox farm collection+cal mag + silica,Soil, start flowering on Jul. 19th. Strain unknown

 

[SoOrbudgal]

Lookin burnt my 1cent, sorry

 

[SoOrbudgal]

Might be that with nute heavy?

 

[s62]

Looks like lightburn to me, but I’m a noob.