Light stress, or just fading?

The closer I get to the end of my first grow the more questions I seem to have. I'm pretty sure this is light stress. I'm only seeing it on the taller sites. Could it just be fading? This is day 54 of flower under a mars hydro ts 3000w. The light was 12 inches from the cola in the pic. I just raised it to 18 inches.

She just looks a little hungry to me.

She looks fine to me.

I thought as the flowering process continues, fan leaves are expected to yellow and fall off as nutrients are directed to buds..?

Leo Light said:

I thought as the flowering process continues, fan leaves are expected to yellow and fall off as nutrients are directed to buds..?

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That only happens in the lower leaves. If it’s all over or happening rapidly, it’s a underlying issue.

Thanks, guys. I think I must just have a case of newbie nerves. The closer things get to the end the more worried I get. Spotted the first amber trichomes tonight.