Modified Obstacle Lights for Windenergy in France

French +4° Modified Beam Medium Intensity

Flashing obstacle lights at night have a great influence on the acceptance of wind energy.

The French authorities have approved a special version of the ICAO Medium Intensity Type B light with an elevated beam. The centre of gravity has been moved to +4° above the horizon.
(Arrêté du 29 mars 2022 modifiant l’arrêté du 23 avril 2018 relatif à la réalisation du balisage des obstacles à la navigation aérienne )

Lanthan has implemented this feature and is in process of certification with the french authorites.

Find the Datasheet here:
Modified Medium Intensity Obstacle Light Type B for nightime marking r2k(FR)

Modified Medium Intensity Obstacle Light Type B for nightime marking w20kr2k(FR)

The areas in this graph visualise the area where the intensity of the lights is brighter than the night sky.
It is simulated for a clear night with an atmospheric visibility of 20 km and for a dark night.
At an installation height of 150m, the lower boundary is approximately 25m above the ground. For smaller wind turbines, it will be more visible, but still significantly darker than a standard ICAO light.