Changing light wiring topology

[drArqon]

I am doing a major renovation at my home and my goal is to build smart lighting system. I aim to make a setup as much future-proof as possible. At this moment I am considering using Sonoff stack as it provides me with basic level of automation for reasonable price, It will play nicely with my HA setup.

Below I attached a conceptual diagram presenting the current and target wiring topology.

I am curious about the opinions and experiences of similar setups.
I can not find any regs information on using a 1mm flexible cable for all light connections.

 

[ericmark]

Basic three ways to automate the lighting, smart switch, smart relay, smart bulb. Each has plus and minus points, the relay should it go wrong, often harder to access to put right, I have made this error, as yet not gone wrong, but it is a worry, it however does not always respond to the switch, but voice commands work well.

The smart bulb, becomes expensive when your using a chandelier, or other multi-bulb lighting method, however faults very easy to correct, it is literary plug and play, switching the wall switch off/on will activate the bulb, but so will any power cut.

Smart switches with neutrals never tried, without a neutral a power cut means lights switch off, so on power return you need to turn them back on, using a switch with a battery can get around this problem.

But in the main the problem is what the units can do, any switch or relay is useless at changing colour, this has to be done in the bulb, and dusk and dawn features are not offered with all devices, the same with fade in and fade out. The Tapo button seems a good idea, looks like a switch, but is wireless, and can link to bulb or relay.