Hi everyone, I have a question. If i will buy 20 downlights and about 5 ceiling lights and i will need to set every room alone, need I buy something more or mobile phone and xiaomi wifi router and lights are enough for using??? Thanks a lot for answer…
If you don’t want wireless switches, than that is all you need - a Wifi router and a phone. Mind you that it is pretty unpractical to always turn lights on/off via phone 
So if you want to add aqara or yeelight switches, you need a xiaomi gateway (hub)
That means, i can not on lights with normal switch? I thought I will switch on, set the light and then only switch on or off without phone.
Of course you can, but that kind of defeats the purpose… Also, you might have problems with bulbs having to reconnect to the WiFi every time you switch them off/on, and IMHO something might go wrong…