@Solla-topee 1, 2, working on it... 3. OK, I tried the HDR feature for some time. Now the noise pattern is very different, but overall image quality is not. a) First screenshot pair - shortly after...

@Solla-topee This spotlight/IR-cut phenomenon was reported only as a side-note. After another reboot (or two) the camera is able to get back to full-color, I can hear no more ir-cut filter "click"....

I`ve just bought a Tapo C235WB V2, connected it via Ethernet cable, I observe very similiar low-light issues. The camera does not respond to any changes - Resolution / HDR / Spotlight settings do not...