https://android.chk.digital/2015-11-16/failed-attempt-philips-hue/
In short: these bulbs do not get dark enough by far, they can be programmed from about 50% brightness up, not lower.
Conclusion: no way to use that system.
If anybody knows a (commercially available) light system that can be dimmed from 0% to 100% using an android device: please leave a comment or drop me an email!