Using openhab 2, some scripts and a couple of zwave lightbulbs with adjustable color temperature, I've created something very similar. The lights turn on automatic using presence detection and change temperature using a simulated sunset. I'm working on a ray-tracer, simulating a true sunset, which would allow different lights to produce various parts of the spectrum. The problem lies with the bulbs, which do not allow enough fidelity over RGBW (either color or warm light, not both).