Beam shaping for spiral LED filament systems

A light-emitting diode (LED) filament system comprising:

• a LED filament comprising:
• a carrier arranged in the shape of a spiral formed by successive loops;
• a plurality of LEDs arranged in a linear array on one side of said carrier;
• wherein said LEDs are arranged along the carrier in sections, each section has a position along the spiral-shaped carrier, wherein the LEDs are arranged in a single linear array on the one side of the carrier, and each section includes a respective entire predetermined length of the carrier that includes two or more LEDs;
• and
• a controller configured to control a power supply to a section, or to a group of sections, of the LED filament;
• wherein said controller is adapted to control a section or a group of sections using the position or positions of the section or group, wherein the position or positions are determined using a height and an angle of said section or group along the spiral-shaped carrier,
• wherein said height is a distance from an end portion of the LED filament to the section along a central axis (A) of the spiral shape, and said angle is the position of the section along a loop relative to a starting point of the loop, and
• wherein each loop of the LED filament comprises N sections, and wherein N borders between said N sections of a loop are vertically aligned with N borders between N sections of a successive loop, along the height of the spiral-shaped carrier.