Light emitting device

A light emitting diode, LED, filament lamp providing LED filament lamp light and comprising:

• a first LED filament comprising a first plurality of light emitting diodes, LEDs, arranged on a first elongated carrier, said first plurality of LEDs being electrically connected in a first circuit and configured to emit first blue LED light;
• a second LED filament comprising a second plurality of LEDs arranged on a second elongated carrier, said second plurality of LEDs being electrically connected in a second circuit and configured to emit second blue LED light;
• said second LED filament further comprising a third plurality of LEDs arranged on the second elongated carrier, said third plurality of LEDs being electrically connected in a third circuit and configured to emit red LED light;
• said second LED filament further comprising a first elongated encapsulant configured to at least partly cover the second elongated carrier, the second plurality of LEDs and the third plurality of LEDs, said first elongated encapsulant comprising a first luminescent material configured to convert second blue LED light emitted by the second plurality of LEDs into green converted light,
• a control unit connected to said first, second and third circuits and wherein said control unit is configured to separately control emission of first blue LED light from said first plurality of LEDs, configured to separately control emission of second blue LED light from said second plurality of LEDs and configured to separately control emission of red LED light from said third plurality of LEDs,
• wherein the control unit is configured to:
• in a first operational mode, power only the first plurality of LEDs such that the LED filament lamp light is blue light;
• in a second operational mode, power only the second plurality of LEDs such that the LED filament lamp light is green light;
• in a third operational mode, power only the third plurality of LEDs such that the LED filament lamp light is red light;
• and
• in a fourth operational mode, power the first plurality of LEDs, the second plurality of LEDs and the third plurality of LEDs such that the LED filament lamp is set to emit white LED filament lamp light having a first correlated color temperature, CCT1, in a range from 1500K to 6500K and a first color rendering index, CRI, of at least 80.