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Linking Smart bulbs with a hard switch
(midwest.social)
An unofficial community to discuss Apple's HomeKit systems, devices, and the service as a whole.
What you're looking for is a Shelly relay. I have some wired into switches for various things. For your situation you would put the relay in "detached" mode so the physical switch is not actually switching power but the relay can use the switching action to trigger the automation to the bulbs. The bulbs are always supplied power but the switch can control their state.