Buy an IKEA NYMÅNE ceiling lamp -> insert a brain (smart WiFi switch) to make it smart.
IKEA Nymåne ($40), Sonoff basic ($5), nylon strip
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Step 1: Insert the Sonoff Basic Between the Wire and the Wire Terminal
Insert a Sonoff basic between the wire and the wire terminal in the lamp. Fasten with a nylon strip. Fits perfectly and is invisible once the front diffuser is mounted.
TASMOTA firmware recommended: https://youtu.be/08_GBROKQH0