>>zeisch+U8
There is a somewhat strangely named German brand that sells private IoT door / security cams. Forgot the name, sadly. They’re quite expensive though. My guess is they might sell private lightbulbs.
For home audio, Sonos is great. Their voice assistant is completely locally processed.
>>jorvi+na
You might be thinking of the Homematic IP line, great products for home automation, they also have door locks etc. They are also compatible with just Homematic which doesn't use the internet (so no IoT), but rather a local gateway for controlling the devices. I don't think they have lightbulbs though. The company name is eQ-3