Color temperature controllable lighting device comprising different LED filaments

A lighting device comprising:

• a first elongated light-emitting diode, LED, filament;
• a second elongated LED filament;
• an at least partially light-transmissive envelope at least partially enveloping at least said first LED filament and said second LED filament;
• and
• a base on which said at least partly light-transmissive envelope is mounted;
• wherein said first LED filament is configured to emit light with a different color temperature than said second LED filament;
• wherein said second LED filament is at least partially curved such that it defines at least part of a contour of a volume;
• and
• wherein said first LED filament is arranged at least partially within said volume,
• wherein said first LED filament has a first LED filament length and said second LED filament has a second LED filament length, and wherein said second LED filament length is more than twice as long as said first LED filament length,
• wherein said first LED filament is arranged along a central axis of said volume and said second LED filament forms a helix shape.