Led filament for illumination and disinfection

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

• an array of a plurality of light emitting diodes, LEDs, configured to emit LED light,
• circuitry coupled to the plurality of LEDs,
• a carrier arranged to support the plurality of LEDs,
• an encapsulant comprising a translucent material and a luminescent material configured to at least partially convert the LED light into converted light, wherein the encapsulant at least partially encloses the plurality of LEDs and the carrier,
• wherein the plurality of LEDs comprises a first set of LEDs arranged to emit first LED light in a first wavelength range of 430-490 nm, and a second set of LEDs arranged to emit second LED light in a second wavelength range of 315-420 nm,
• wherein the circuitry is configured to provide the first set of LEDs with a first current, Ic1, and to provide the second set of LEDs with a second current, Ic2, during operation of the LED filament, wherein Ic2>Ic1 and
• wherein the encapsulant, via the luminescent material thereof, is configured to, during operation of the LED filament,
• convert a portion of the first LED light into first converted light at a first conversion ratio, R1, wherein the first converted light has a first converted light intensity, Iconv1, and convert a portion of the second LED light into second converted light at a second conversion ratio, R2, wherein the second converted light has a second converted light intensity, Iconv2,
• wherein R1/R2>3 and 0.7<(Iconv1/Iconv2)<1.3, preferably 0.8<(Iconv1/Iconv2)<1.2.