Abstract: In one embodiment, an LED filament lamp for warm dimming is presented that includes a dimmable LED driver circuit; a first channel LED filament having a first forward voltage drop which emits a first white light of a first correlated color temperature; and a second channel LED filament having a second forward voltage drop and which emits a second white light of a second correlated color temperature warmer than the first correlated color temperature. In another embodiment, an LED filament for warm dimming lamps is presented that includes a light-transmissive substrate; at least one LED die and one non-light-emitting current regulator mounted thereon and connected in series; and an adhesive bead with fluorescent particles suspended therein affixed to the light-transmissive substrate, wherein illuminating the fluorescent particles with the at least one LED die causes the LED filament to emit white light of a predetermined correlated color temperature.

Abstract: In one embodiment, a filament for LED filament lamp is presented, that includes a light-transmissive substrate; at least one LED die mounted on the light-transmissive substrate; and at least one current regulator mounted on the light-transmissive substrate, wherein the current regulator is connected in series with the at least one LED. In another embodiment, an LED filament lamp is presented, that includes a dimmable LED driver circuit; a first channel LED array with at least two LED die and a first forward voltage drop; and a second channel LED array with at least one LED dies and at least one current regulator to cause a second forward voltage drop of the second channel LED array to increase as current through the second channel LED array increases, wherein the second channel LED array is connected in parallel with the first channel LED array.

Abstract: In one embodiment, a filament for LED filament lamp is presented, that includes a light-transmissive substrate; at least one LED die mounted on the light-transmissive substrate; and at least one current regulator mounted on the light-transmissive substrate, wherein the current regulator is connected in series with the at least one LED. In another embodiment, an LED filament lamp is presented, that includes a dimmable LED driver circuit; a first channel LED array with at least two LED die and a first forward voltage drop; and a second channel LED array with at least one LED dies and at least one current regulator to cause a second forward voltage drop of the second channel LED array to increase as current through the second channel LED array increases, wherein the second channel LED array is connected in parallel with the first channel LED array.