New Grower Why are my leaves going brown???

[clint308]

Hi peeps
Is this burnt leaves from the light or nute prob ?
the plants are around 10 inches from light ??(400W HPS)
I can hold back of my hand at plant level no worries it dosnt get to hot
And why is it not on more leaves?
plants are in day 25 of flower

 

[Str8Bacon]

Doesn't look like heat stress. Looks nutrient related. Maybe post in the infirmary.

 

[Dominas999]

10 inches is pretty close, I found if I had mine closer than 12 inches it slowed growth, but def get a thread in the infirmary, some great "doctors" in there