I can recommend this tool to pick a colour and create an RGB-Code (used it quite a lot for another project):
You can set the colour of each rimlight with an R G B-code ( Red, Green, Blue): Inside the package file you will find parameters for RimLight0 (creates glow on the right side of the sim) and RimLight1 (creates glow on the left side of the sim). Open the package file with the lighting mod in Sims 4 Studio.
I have been getting quite a few asks of this kind 🙂 It’s difficult for me to come by every wish (plus I don’t wanna spam) but you can create any colour variants of the lighting yourself, those are just a few simple steps.