The typical operating ranges for barcode scanners are NIR and IR. A sensor detects and evaluates the light signal that is reflected after being generated by LEDs. By reducing “ambient light” impacts, optical filters ensure that only the desired spectrum with the signal to be conveyed reaches the receiver. Additionally, the angle dependency, which frequently causes a wavelength shift, must have a limit in these filters. For filter systems and geometries that are specific to the requirements of the customer, GF Tech specialises in providing the appropriate coatings.