Aside from the method of coupling energy into the mercury vapour, Induction lamps are very similar to conventional fluorescent lamps. Mercury vapour in the discharge vessel is electrically excited to produce short-wave ultraviolet light, which then excites the phosphors to produce visible light.


External inductor lamps are basically fully sealed fluorescent lamps (no electrode entries) with electromagnets wrapped around a part of the tube. High frequency energy, from the electronic ballast, is sent through wires, which are wrapped in a coil around a ferrite inductor on the outside of the glass tube, creating a powerful electromagnet called an inductor.


The induction coil (inductor) produces a very strong magnetic field which travels through the glass and excites the mercury atoms in the interior.


The mercury atoms are provided by the amalgam (a solid form of mercury). The excited mercury atoms emit UV light and, just as in a fluorescent tube, the UV light is down-converted to visible light by the phosphor coating on the inside of the tube. The glass walls of the lamp prevent the emission of the UV light as ordinary glass blocks UV radiation at the 253.7 nm and 185 nm range.


Light-emitting Diodes Introduction
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Low Energy Induction Lights