Led filament comprising leds arranged to emit nir light

A light emitting diode, LED, filament, configured to emit LED filament light, comprising:

• a carrier;
• an array of a plurality of light emitting diodes, LEDs, arranged on the carrier;
• and
• an encapsulant at least partially enclosing the array of the plurality of LEDs and at least partially enclosing the carrier,
• wherein each LED of the plurality of LEDs is arranged to emit LED light comprising at least one of
• violet light having a violet dominant peak wavelength, λ1, in a wavelength range of 380 to 420 nm,
• blue light having a blue dominant peak wavelength, λ2, in a wavelength range of 420 to 470 nm,
• cyan light having a cyan dominant peak wavelength, λ3, in a wavelength range of 470 to 520 nm, and
• red light having a red dominant peak wavelength, λ4, in a wavelength range of 600 to 660 nm;
• wherein the encapsulant comprises a near-infrared, NIR, phosphor configured to convert at least part of the LED light emitted from the plurality of LEDs into NIR converted light having a NIR dominant peak wavelength, λ5, in a wavelength range of 700 to 1400 nm;
• wherein the LED filament light comprises the NIR converted light,
• wherein the carrier comprises a first major surface and a second major surface opposite to the first major surface, and wherein the encapsulant comprises a first encapsulant at least partially enclosing the array of the plurality of LEDs and at least partially covering the first major surface and comprising the NIR phosphor;
• and
• wherein the first encapsulant comprises a visible phosphor configured to convert at least part of the LED light emitted from the plurality of LEDs into visible converted light having a dominant peak wavelength, λ6, in a wavelength range from 420 to 700 nm, wherein the LED filament light comprises the visible converted light.