The development of low frequency, high output electrodeless fluorescent lamps

Investigations into the operating parameter space of electrodeless fluorescent lamps have led to the develop ment of a new high efficacy, low profile, and scalable lamp construction. Previous commercially available electrodeless fluorescent lamps all operate at a frequency of 2.65 MHz or higher. The new electrodeless lamp is unique in that it operates at a frequency of 0.25 MHz, which significantly reduces the difficulty of controlling EMI. In this paper we present information on lamp design, operating parameters, electrical and photometric characteristics, lumen temperature behavior, and lumen run-up performance. The long life and white light of these high performance, low profile systems makes them attractive for various industrial, commercial, and municipal applications. They are particularly advantageous in applications where lamp replacement is difficult, costly, or hazardous, and where lighting is required for many hours during the day.