The rapid growth of cellular phone industry and other communication services has led to the millions of new communication towers being erected all over the world. Since they present hazard in the flight path of aircrafts, these towers need to be marked with obstruction warning lights. Depending upon the high of the structure high, medium or low intensity lights mark these structures. Generally DC powered systems are used for these structures. These lights have been so designed that they do not produce any radio interference while operating. These obstructions lights have to be maintained for continuous operation throughout the life.