A lighting device for use in a luminaire comprising: - a base having a longitudinal axis 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 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.