LED lighting device compatible with night vision devices

摘要

A lighting device comprises one or more white LEDs 1 and a near infrared (NIR) filter 2 for illuminating a control panel or display 8 with light which does not interfere with a night vision device 9. The light of the LEDs 1 is in an area of u 0.18 and v 0.45 of the u v diagram of the CIE-LUV chromaticity diagram, which may correspond to warm white LEDs. The filter comprises an absorbing filter glass having a descending light transmittance between 500nm and 800nm. The thickness of the filter is chosen so that a sufficient blocking effect is provided in a range of wavelengths between 600nm and 800nm, so that the colour coordinates of the filtered useful light are in an area with a radius of 0.055 around coordinates u = 0.18 and v = 0.50 of the u v diagram.