A new LED bulb from the furniture maker Ikea of Sweden comes with its own remote controller which mounts to the wall and uses Bluetooth to switch the bulb on and off, adjust bulb color temperature and dimming level. One interesting point about the bulb: It uses two separate strings of LEDs, apparently as a way to more easily implement dimming and color changes. That introduces some complexity into the design that we discovered as we analyzed the bulb.
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