In physics terms, light is a form of electromagnetic radiation. Light visible to the human eye is in the wavelength range between 380 and 780 nm. The UV (ultraviolet) and IR (infrared) ranges are just outside either end of this range. Systems which cure by means of radiation accordingly use UV light (wavelengths between 100 and 380 nm) to cure inks, varnishes, silicones, seals and adhesives, for example. Besides UV arc lamps, LED systems have seen increasing use in industrial curing since the turn of the millennium. When LEDs (LED is an abbreviation of the English “light-emitting diode”) are used in industrial applications, they are combined in small construction units to suit the output required.
LED systems for curing inks or adhesives can be cascaded as a function of module width, and thus varied in length. The power supply cables present a challenge to cascading. If modules are now lined up with one another, parallel switching of these power supplies would be required. To get round this issue, this requirement was taken into account back at the layout design stage and solved by means of an internal power supply system.