iOS Home app brightness

Brightness in Home app does not work as intended; even if I set brightness to maximum it’s way less bright than using Yeelight/Xiaomi Home/Google Home apps.
I bought this bulb for the HomeKit (Home app) integration… This does NOT work…
I have the latest iOS version (13.3.1) and the latest firmware for the bulb according to Yeelight app (2.0.6_0035).