Light spectrum and fall colours

Hello buddy. The purple color comes from difference of temperatures so it means your plant got cold so in order to protect herself she produce a pigment called anthocyane which result in purple pigmentation. It is like she put suncream protection but against the cold. Secondly it can comes from the genetic too . otherwise effects of spectrum light are that your plant assimilate better the light if the spectrum is good it have an effect on the height , the internodal distance, the flowering for sure etc... It is for that we need to use special lamps for each stage . ( growth and flowering). It is a huge theme and there is so much to say we can speak about effect of spectrum light all the night.. So try to have a higher temperature during the night if you Don't want purple shades. Good luck. Peace

Thanks so much for the answer, I suppose there must be hot and cold spots in the tent but it’s interesting that not all the plants turned purple at the same time. Happy growing!

Hi there Leights, yeah the spectrum has a bunch of different impacts, for example in terms of energy production for the plant. but what's actually happening here is a temperature related issue. you're a bit cold at night, so that's why you're seeing these colors. Hope this helps ! 🚀