While this cost seems irrelevant, it adds up as a large count is implemented throughout a structure and the expense is increased due to backup power requirements. The purchase price of LED identifiers can range from twenty to one-hundred dollars with yearly operational expenses averaging one dollar per sign. A battery or generator based backup source is necessary for this type of signing to ensure availability in the instance of extreme emergency conditions where main power fails. LED-based products use a semi-conductor form of technology in combination with an electrical source to provide a consistently lit identifier. Each option has specific benefits however, only one offers the convenience of a lower cost, safe visual resource. Three choices have arisen as the most popular methods for making a building compliant with local safety regulations: Tritium, LED, and photoluminescent.
