Lighting device such as a LED reading light

A lighting device useable in reading light in a vehicle, comprising a single light-emitting diode and internal supply means adapted to generate a current to the single light-emitting diode, the internal supply means being connectable to an external power network, the device having an optical unit to recenter and focus the luminous flux emitted by the single light-emitting diode, the optical unit being made of a complex single-piece optical structure having a first surface in which is positioned a frustoconical volume accommodating the light-emitting diode, a second surface opposite to the first surface and having an unbroken central portion facing said volume and forming an aspherical lens, and a peripheral portion having aspherical microlenses in a honeycomb hexagonal network, the optical structure having a reflector portion forming an aspherical surface that is quasi-parabolic between said first surface and second surface.