This is the correct answer. The bulb itself doesn’t necessarily have to be FOSS. Really you just need bulbs operating on something other than wifi, and ideally without a proprietary hub. Hue bulbs can be made to run on ZigBee. Z-Wave bulbs also exist. Then controlling them should happen through HA. If it’s just LED strips, ESP controlled ones are a great option.
Home assistant and its various alternatives
This is the correct answer. The bulb itself doesn’t necessarily have to be FOSS. Really you just need bulbs operating on something other than wifi, and ideally without a proprietary hub. Hue bulbs can be made to run on ZigBee. Z-Wave bulbs also exist. Then controlling them should happen through HA. If it’s just LED strips, ESP controlled ones are a great option.