This is the reason I decided to use 4000K instead of the more physically accurate 5400K. I picked a less middle of the day color temperature and closer to evening time, basically.

I spent a lot of time looking at LED suppliers and there's quite a range of options in terms of color temperature. Some manufacturers even have 2 color temps on the same LED package, meaning you can sort of do what you describe by mixing two light sources at a distance less than a millimeter.

> Honestly I want to build something like this but my area of expertise is too far into the software domain, and not very far into the hardware or electrical engineering domain.

That was me last year before starting this project! You'd be surprised what you can achieve with time and effort!