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Tradfri LED bulb E14 470 lumen, warm dimming, chandelier opal white
Model LED1903C5 manufactured by IKEA
Tradfri LED bulb E14 470 lumen, warm dimming, chandelier opal white
Supports:
brightness
on/off
Product Code:
704.243.12
Zigbee ID: "TRADFRI bulb E14 WS 470lm"
Confirmed working with

Pairing Instructions
Factory reset the light bulb (video instructions [video]). After resetting the bulb will automatically connect.

While pairing, keep the bulb close to the Zigbee gateway.

What works is to use (very) short “on”’s and a little bit longer “off’s”. Start with bulb on, then off, and then 6 “on’s”, where you kill the light as soon as the bulb shows signs of turning on.