Leaves browning week 5 flower is this normal

[MisfitDaddy87]

This is my first grow I switched to 12/12 35 days ago so I'm roughly 5 weeks into flower I'm growing in coco peat with perlite feeding 3 times a day with Advanced Nutrients perfect ph micro, grow, bloom I added big bud and bud candy in week 2 nutes are usually around 800 ppm everything has been good and getting nice and sticky but the leaves are browning pretty good at this point I haven't changed anything since adding the big bud and bud candy I did read that as plants flower that the leaves will start to die and was just wandering if that's what this is or should I be worried

 

[cocoJoe]

Your light might might be to close..

 

[Galgrows]

Or it could be a sign of nitrogen toxicty from a month back now showing tip burn.

 

[MisfitDaddy87]

I think it is the light now that you mention it because seems to be the taller branches that are turning brown