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Control light without 3rd party app
(mander.xyz)
Home Assistant is open source home automation that puts local control and privacy first.
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So, here's where Home Assistant (HA) can get confusing - there are multiple ways to accomplish multiple things.
The integration you installed is meant to integrate an existing Hue ecosystem with HA. You don't have (nor want, I presume) a Hue ecosystem. You want direct control of the bulb via HA.
Phillips devices generally utilize a wireless protocol called "ZigBee". It's similar to wifi and Bluetooth in that it runs within the 2.4 GHz frequency band, but it requires a ZigBee antenna, also known as a "coordinator". One of those can be picked up for around $30, and you only need one - ZigBee is a "mesh" network. Mains-powered ZigBee devices act as repeaters to automatically expand the network. It works exceptionally well, but you will feel it if you have lots of ZigBee devices and use 2.4GHz wifi.
Thanks for the elaborate explanation.