According to ICAO – Annex 14 Medium Intensity Obstruction Lights – Type A Ex, B Ex or C Ex – have to
be used where the obstacle is particularly large and the height of the surrounding ground is more
than 45m in hazardous areas.
Medium Intensity Obstacle Lights Type A Ex and C Ex have to be used alone, whereas Medium
Intensity Obstacle Lights, Type B Ex, should be used either alone or in combination with Low Intensity
Obstacle Lights, Type B Ex.
The Medium Intensity Obstruction Lights Type A Ex is white flashing.
The Medium Intensity Obstruction Lights Type B Ex is red flashing.
The Medium Intensity Obstruction Lights Type C Ex is red steady burning.
