Michael F Landi

US Patent:

20150138756, May 21, 2015

Filed:

Oct 7, 2014

Appl. No.:

14/508122

Inventors:

- Mainz, DE
Steffen Reichel - Mehlingen, DE
Michael Landi - Hughestown PA, US

International Classification:

F21V 9/04
F21K 99/00

US Classification:

362 971, 362293

Abstract:

A lighting device is provided that includes an LED and an NIR filter for a control panel or a display, which does not interfere with a night vision device. The light of the LED is in an area of u′>0.19 and v′>0.46 of the u′v′ diagram of the CIE-LUV chromaticity diagram. The NIR filter exhibits descending light transmittance between 500 nm and 800 nm. The thickness of the NIR filter is chosen so that a sufficient blocking effect is provided in a range of wavelengths between 600 nm and 800 nm, so that the color coordinates of the filtered useful light are in an area with a radius of 0.04 around coordinates u′=0.19 and v′=0.49 of the u′v′ diagram.