A tubular skylight comprising; - a roof mounted element, for collecting exterior light, - a ceiling mounted element, - a tube connecting the roof mounted element and the ceiling mounted element, and - a diffuser element, for distributing the exterior light in a room, wherein the diffuser element is mounted in the ceiling mounted element, wherein the diffuser element comprises a first diffuser pane with a translucent bottom portion and a sidewall portion with a translucent light path zone, wherein the tubular skylight has means configured for affecting the luminance of the light exiting the diffuser such that the luminance of the light exiting through the light path zone has a different luminance than the light exiting through the bottom portion, wherein the bottom portion is substantially planar having a width-to-height ratio of more than 6, wherein the bottom portion adjoins the sidewall portion at a transition line, wherein the sidewall portion is substantially parallel to a central axis through the diffuser element, wherein the ceiling mounted element and the diffuser element are configured for providing a light passage from the light path zone to the room in the form of a free space adjacent the light path zone, wherein the tubular skylight comprises a reflector, wherein the reflector has a reflective surface facing the light path zone, wherein the reflective surface is arranged with an acute angle in relation to the central axis and with a vertex above the bottom portion, wherein the diffuser element comprises a ledge, wherein the ledge is protruding from the sidewall portion, and wherein the light path zone is arranged between the ledge and the bottom portion, characterised in that the free space is outlined by the sidewall portion, the ledge, and the reflector. - a roof mounted element, for collecting exterior light, - a ceiling mounted element, - a tube connecting the roof mounted element and the ceiling mounted element, and - a diffuser element, for distributing the exterior light in a room, wherein the diffuser element is mounted in the ceiling mounted element, wherein the diffuser element comprises a first diffuser pane with a translucent bottom portion and a sidewall portion with a translucent light path zone, wherein the tubular skylight has means configured for affecting the luminance of the light exiting the diffuser such that the luminance of the light exiting through the light path zone has a different luminance than the light exiting through the bottom portion, wherein the bottom portion is substantially planar having a width-to-height ratio of more than 6, wherein the bottom portion adjoins the sidewall portion at a transition line, wherein the sidewall portion is substantially parallel to a central axis through the diffuser element, wherein the ceiling mounted element and the diffuser element are configured for providing a light passage from the light path zone to the room in the form of a free space adjacent the light path zone, wherein the tubular skylight comprises a reflector, wherein the reflector has a reflective surface facing the light path zone, wherein the reflective surface is arranged with an acute angle in relation to the central axis and with a vertex above the bottom portion, wherein the diffuser element comprises a ledge, wherein the ledge is protruding from the sidewall portion, and wherein the light path zone is arranged between the ledge and the bottom portion, characterised in that the free space is outlined by the sidewall portion, the ledge, and the reflector.