Turning purple kush purple

Yes, cooler temps, a good breeze and intense lights including uv, will aid the purple colourisation for sure. But most importantly not all phenotypes of red /purple strains will go red or purple. I had this with my purple alaskan, no purple at all.

As far as I know, it's a genetic thing that varies by phenotype. You either get purple or you don't. I did nothing special with temps and my Purp Kush was purple.

Ya. Id like the bag appeal. But its no biggie.. im just hoping for it seeing if i can make ot work. Thanks tho man. Appreciate it

Dropping temperatures at night will do it, but its generally regarded as sacrificing potency for looks. If it has the genes, it will likely purple without the temp drop anyway. This generally happens in the last two weeks anyway. The temp drop is also though to produce more terpenes, giving your bud a better taste, but this is mostly unproven. In the end, I'm not sure it's worth it unless you really want the extra "bag appeal".