My plant is turning purple? UVB cause this? Or what else?

[OttawaGreen]

Does UVB supplementation cause plants that were not formally purple to turn purple?
Also when people say that low temperatures cause that, how low? I am hitting 17°C at night which is about 63 Fahrenheit I think. That's not low enough for purpling is it?
I have been growing these chocolope for many grows with HPS with higher temperatures and no UVB, they have never turned purple before. Now I have switched to LED and UVB and the temperature has come down and just today after 8 1/2 out of 10 weeks of bloom they change this color. Otherwise seem very healthy. Check out my journal in signature for more information.

Do you guys that use UVB supplementation find that your plants turn purple when they didn't before? It's seem the trichomes on the tops of my leaves were turning Amber and purple from early on.

https://www.icmag.com/ic/picture.php?albumid=58565&pictureid=1374361

 

[OttawaGreen]

Trichomes seem normal on bud just amber and purple on leaves

 

[RonSmooth]

I have never used UVB and have had plants turn all sorts of colors later in flowering. The leaves change color as the flowers mature and eventually drop/

Purple trichomes are a different issue. I havent seen any but I dont spend much time looking at them. Perhaps the purple in the trichomes is coming from the leaves. They could be clear/translucent.

 

[stoned-trout]

cool temps/genetics.. I had strains that would only purple in the winter grows a few times...

 

[Chunkypigs]

some plant will purple without cold when they are ripe and finished.

 

[Kygiacomo!!!]

that dont look like purple trichs to me..looks like they are amber which is a sign that the plant is ripe