In the IkeaColorTemperatureLamp, the Item for controlling IKEA Trådfri's white spectrum lamps the new feature WarmDim is now added. When WarmDim is activated, the color temperature is automatically turned warmer the more dimmed the light is, to emulate the way normal incandescent bulbs turns orange when dimmed low. This makes the dimming look more natural.
You can still set a color temperature for the lamp, which will be used when the lamp is at full power, but the more it is dimmed the warmer the light will get, starting from the set value.
The feature is in the nightly build.