These lamps are designed for night marking a wide range of structures: tall buildings, chimneys, bridges.
Certification and regulations:
ICAO ANNEX 14, Volume I, Chap. 6 Visual aids for denoting obstacles
ICAO TYPE A, ICAO TYPE B, Low intensity obstacle light
FAA AC 150/5345-43F Specification for obstruction lighting equipment
FAA Type L-810, Low intensity obstacle light