A lighting device for use in a luminaire comprising: - a base having a longitudinal axis (LA) and comprising an electrical connector for connecting the lighting device to a luminaire socket of the luminaire , - at least one LED-filament comprising a substrate having an elongated body and a plurality of light sources mechanically coupled to the substrate , the plurality of light sources configured for emitting light in a first spatial light distribution, - at least one light guide having an elongated body, comprising at least one light in-coupling portion at least on the external periphery of the at least one light guide for coupling light into the at least one light guide , a plurality of light out-coupling portions for coupling light out of the at least one light guide in a second spatial light distribution, - an at least in part light-transmissive envelope at least partly encapsulating said at least one LED-filament and said at least one light guide , - wherein the at least one light guide is arranged for guiding the light coupled into the at least one light guide at the at least one light in-coupling portion via total internal reflection to the plurality of light out-coupling portions , - wherein the at least one LED-filament is external to the at least one light guide - wherein at least part of the light emitted by the plurality of light sources is coupled into the at least one light guide , and - wherein the lighting device comprises at least one further light source , wherein at least part of the light emitted by the at least one further light source is coupled into the at least one light guide , characterized in that the average diameter of the at least one light guide is in range from 0.5 times the average diameter of the at least one LED-filament and 2 times the average diameter of the at least one LED-filament . - a base having a longitudinal axis (LA) and comprising an electrical connector for connecting the lighting device to a luminaire socket of the luminaire , - at least one LED-filament comprising a substrate having an elongated body and a plurality of light sources mechanically coupled to the substrate , the plurality of light sources configured for emitting light in a first spatial light distribution, - at least one light guide having an elongated body, comprising at least one light in-coupling portion at least on the external periphery of the at least one light guide for coupling light into the at least one light guide , a plurality of light out-coupling portions for coupling light out of the at least one light guide in a second spatial light distribution, - an at least in part light-transmissive envelope at least partly encapsulating said at least one LED-filament and said at least one light guide , - wherein the at least one light guide is arranged for guiding the light coupled into the at least one light guide at the at least one light in-coupling portion via total internal reflection to the plurality of light out-coupling portions , - wherein the at least one LED-filament is external to the at least one light guide - wherein at least part of the light emitted by the plurality of light sources is coupled into the at least one light guide , and - wherein the lighting device comprises at least one further light source , wherein at least part of the light emitted by the at least one further light source is coupled into the at least one light guide , characterized in that the average diameter of the at least one light guide is in range from 0.5 times the average diameter of the at least one LED-filament and 2 times the average diameter of the at least one LED-filament . <EOS>