Induction Lamp

While similar to fluorescent technology in many respects, induction light sources are fundamentally different. Like fluorescent, induction lamps operate on the basis of an electrical current being produced within a glass enclosure (bulb) that contains a mixture of gases that are held under specific pressure conditions. Electrical current within the glass enclosure excites the gases, which stimulates the emission of ultra-violet light. This ultra-violet light is subsequently converted to visible light by phosphors (white powder) that line the inside of the glass envelope.

With fluorescent lamps, the electrical current is produced via electrodes residing at either end of the lamp tube. In contrast, induction lamps utilize a high frequency generator to create an oscillating magnetic field that induces electrical current within the gas mixture. The glass enclosure is transparent to this magnetic field, which allows energy to be efficiently transferred from the electrical power supply to the gases within the glass enclosure without the use of filaments or electrodes. Since these components are a primary failure mechanism of traditional light sources (incandescent, fluorescent, metal halide), their removal from the system results in dramatically improved lamp life (50K+ hours). In fact, the bulb portion of the induction lamp system is completely sealed and contains no electrical components that breach, or threaten to compromise the integrity of the sealed enclosure. A small amount of phosphor degredation does occur with extended use, but the life of the bulb is essentially indefinite. Consequently, the rated life of induction lamps is based on the life of the electronic components that comprise the electrical power supply rather than failure of the lamp itself.

In addition to the tremendous maintenance benefits afforded by long life, the induction lamp rounds out its impressive list of attributes with energy-efficient, color-constant white light, high lumen maintenance and “instant-on’ capability. This makes induction lighting particularly well suited to a number of demanding applications.

Note that the long-term performance of induction lighting systems is highly dependent upon thermal management. The lamp manufacturer provides specific criteria that must be met in order to qualify for warranty protection. Additionally, the length of the electrical cord that connects the power supply to the lamp is fixed (see photo) as a consequence of the induction lamp's high frequency operation.

Related Resources
Pulse Start Metal Halide Lamps
Ceramic Metal Halide Lamps