ASD-STAN prEN 4706 (04/27/2017)

The chromaticity coordinates and brightness of LEDs of the same type have variations caused by the manufacturing process; this applies to white LEDs and coloured (monochrome) LEDs. Therefore LEDs have to be selected by the manufacturer into 'Colour ranks'. Also the brightness of LEDs has certain variations, therefore the LEDs are also selected into 'Brightness ranks'. The step width of these ranking systems depends on the manufacturer and the LED type. For certain applications, e.g. inside an aircraft cabin, a high quality light is demanded, so a manufacturer independent standardization is desirable. The purpose of this standard is to provide a simple classification system to enable the end user to define lighting colour accuracy. The decimal sign in this document is a comma.