Leaves lighter at top

[skudra]

I have some tip burn (light stress?) at the very top and leaves are looking lighter at top with dark green veins and lighter color in-between. Is this light stress? If cal-mag wouldn’t it start at the oldest leaves? Running an Optic Slim 650S at lowish par for flowers of 440 in Pro-Mix HP although I went up to 600 Par the other day and I seemed to see this shortly after. Using Advanced Nutrients. Using a SpotOn Par meter. Other than that the plant looks quite healthy. Just want to make it to harvest.

 

[namvet25]

Plant looks great,

 

[Jpkindbud]

Newer growth will be lighter than old, all I see is a slight tip burn, prob from nutes.