Red/purple trichomes - Rot, mold, or just purpling

So I have a group of 6 plants, 4 different strains. SF2000 light about 15-18 inches from those plants tops that are affected. I've been fighting humidity in flower and it's about 50-60% depending on which meter I'm reading (have multiple RH sensors running). I have 3 fans inside the small tent so at least air flow is really good despite the higher than desired RH.

I've noticed that the tips of some of the bud was red/purple in color and started to worry if it was the beginning of rot or just purpling of the tips from the close LED light. I've only noticed it at the tops of two different plants. Here are some scope pictures and one of the overall bud. Currently at 54 days from 12/12 flip.

Appears it's only the tip of the flower that is turning purple much like some of the top of my fan leaf stems. Don't mind the mangled trichomes. I was picking at it to check the inner portion for any other signs.

Couple of the calyx are turning deep purple. Going to be interesting how these turn out.

Just looks like the colors are coming out. Mine did that around day 50. It’s not a purple strain either, nor was it rot. One thing I noticed though, I intentionally drop my temp 5 degrees every week before harvest. Maybe it was the cooler temp that induced the colors. Haven’t really seen any other strains do that. Still puzzled. But it did give a nice bag appeal.

Dontjudgeme said:

Just looks like the colors are coming out. Mine did that around day 50. It’s not a purple strain either, nor was it rot. One thing I noticed though, I intentionally drop my temp 5 degrees every week before harvest. Maybe it was the cooler temp that induced the colors. Haven’t really seen any other strains do that. Still puzzled. But it did give a nice bag appeal.

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Yeah this isn't a purple strain either. The stock photos from the seed company doesn't show a ton of brown pistils either but both plants are loaded. I can only guess they are some different phenos and/or just reacting to their current environment.