Led filament and led filament lamp

Abstract

A LED filament (10) providing LED filament light, comprising: an elongated carrier (11); a plurality of blue LEDs (12a, 12b, 12c) mounted on a mounting side (11a) of the elongated carrier, wherein the plurality of blue LEDs (12a, 12b, 12c) includes: a first individually controllable array of blue LEDs (12a) emitting first blue LED light, a second individually controllable array of blue LEDs (12b) emitting second blue LED light, and a third individually controllable array of blue LEDs (12c) emitting third blue LED light; and an elongated encapsulant layer (14) covering all LEDs (12a) in the first individually controllable array and all LEDs (12b) in the second individually controllable array, said elongated encapsulant layer formed by a first luminescent material having a first concentration, C1, of luminescent particles, wherein the blue LEDs (12b) in the second individually controllable array are covered by first encapsulant spots (15) formed by a second luminescent material having a second concentration, C2, of luminescent particles, wherein C2>C1, and wherein the blue LEDs (12c) in the third individually controllable array are covered by second encapsulant spots (16); wherein: (i) the second encapsulant spots are free from a luminescent material, or (ii) the second encapsulant spots are formed by a third luminescent material having a third concentration, C3, of luminescent particles, and wherein C3<C1, and wherein the second encapsulant spots are at least partly covered by the elongated encapsulant layer (14).

Dependencies are inferred from the claim text.