Interesting concept
I think it will require at least 2 parts:
- Computer-side that's monitoring the chat, YouTube counter or whatever
- Hardware to switch the bulb
For the hardware, many ESP based devices are available, like Sonoff S20/S26 or Shelly, but it may need a firmware replacement as the regular API isn't that easy. I'm currently involved in the development of
ESPEasy, that is very usable on ESP8266 and ESP32 based devices. With simple http GET requests you can control such device, but, some assembly required.
I know that a few years back, many developers set up lava lamps to show the commit pre-checks and build results of their CI/CD pipelines, not sure if that is still used much, as it requires physical availability of people to see the lights. Nowadays, with most of development wfh/remote there must be other ways