Aircraft landing light unit, comprising: a plurality of LEDs, and an optical system associated with the plurality of LEDs for shaping a light output of the aircraft landing light unit for illuminating an aircraft environment, characterized in that the aircraft landing light unit further comprises: a control unit for controlling the plurality of LEDs, and a photo detector arranged for detecting light, emitted by the plurality of LEDs, output via the optical system and reflected by atmospheric haze, such as clouds, fog, rain and snow, wherein the control unit is coupled to the photo detector and is configured to control the plurality of LEDs on the basis of the light detected by the photo detector, thereby adjusting the light output of the aircraft landing light unit to the atmospheric haze, wherein the control unit is configured to compare the light detected by the photo detector to a reflection threshold value and to decrease the light output of the aircraft landing light unit as a response to the light detected by the photo detector being above the reflection threshold value, wherein the plurality of LEDs comprises a first subset of LEDs and a second subset of LEDs, with the first and second subsets of LEDs being separately controllable, and wherein the control unit is configured to dim or to switch off the first subset of LEDs as a response to the light detected by the photo detector being above the reflection threshold value, wherein the first subset of LEDs provides for more illumination in a pilot forward vision direction than the second subset of LEDs, and wherein the second subset of LEDs provides for a broader field of illumination than the first subset of LEDs. a plurality of LEDs, and an optical system associated with the plurality of LEDs for shaping a light output of the aircraft landing light unit for illuminating an aircraft environment, characterized in that the aircraft landing light unit further comprises: a control unit for controlling the plurality of LEDs, and a photo detector arranged for detecting light, emitted by the plurality of LEDs, output via the optical system and reflected by atmospheric haze, such as clouds, fog, rain and snow, a control unit for controlling the plurality of LEDs, and a photo detector arranged for detecting light, emitted by the plurality of LEDs, output via the optical system and reflected by atmospheric haze, such as clouds, fog, rain and snow, wherein the control unit is coupled to the photo detector and is configured to control the plurality of LEDs on the basis of the light detected by the photo detector, thereby adjusting the light output of the aircraft landing light unit to the atmospheric haze, wherein the control unit is configured to compare the light detected by the photo detector to a reflection threshold value and to decrease the light output of the aircraft landing light unit as a response to the light detected by the photo detector being above the reflection threshold value, wherein the plurality of LEDs comprises a first subset of LEDs and a second subset of LEDs, with the first and second subsets of LEDs being separately controllable, and wherein the control unit is configured to dim or to switch off the first subset of LEDs as a response to the light detected by the photo detector being above the reflection threshold value, wherein the first subset of LEDs provides for more illumination in a pilot forward vision direction than the second subset of LEDs, and wherein the second subset of LEDs provides for a broader field of illumination than the first subset of LEDs.