HIGH INTENSITY AVIATION OBSTRUCTION LIGHT (HIOL)
- Type A(Intensity>200’000 cd) WHITE-FLASHING LIGHT
- Type B(Intensity>100’000 cd) WHITE-FLASHING LIGHT
HIOL-A, should be used to indicate the presence of an object if its H > 150 m and an aeronautical study indicates such lights to be essential for the recognition of the object by day
HIOL-B, should be used to indicate the presence of a tower supporting overhead wires, cables, etc.