The optic is located at a height of 34 metres (112 ft), within a lantern room at the top of a limestone tower which has been painted white with a broad central black band.
The two keeper's houses are built close by, but the light is now maintained by an attendant living some distance away, who monitors the equipment via a radio link.

With a focal height of 34 metres (112 ft) above the sea, the light from the first order Fresnel lens could be seen for 20 nautical miles in the case of white light and 16 nautical miles for the red light.
With the installation of the LED light, this has reduced to 18 and 11 nautical miles respectively.

The light characteristic is now slightly different from that of 1913, the light emits a white or red light, depending on the direction, in isophase of 12 seconds, that is, it is illuminated for six seconds and darkened during other six.
It emits red light in the sector between 245 ° and 269 °.

In addition, the lighthouse is equipped with a radar or RACON beacon that emits the letter K in Morse code with a range of 13 nautical miles.
The optic is located at a height of 34 metres (112 ft), within a lantern room at the top of a limestone tower which has been painted white with a broad central black band. The two keeper's houses are built close by, but the light is now maintained by an attendant living some distance away, who monitors the equipment via a radio link.
With a focal height of 34 metres (112 ft) above the sea, the light from the first order Fresnel lens could be seen for 20 nautical miles in the case of white light and 16 nautical miles for the red light. With the installation of the LED light, this has reduced to 18 and 11 nautical miles respectively.
The light characteristic is now slightly different from that of 1913, the light emits a white or red light, depending on the direction, in isophase of 12 seconds, that is, it is illuminated for six seconds and darkened during other six. It emits red light in the sector between 245 ° and 269 °.
In addition, the lighthouse is equipped with a radar or RACON beacon that emits the letter K in Morse code with a range of 13 nautical miles.
Inisheer Lighthouse