Decrease in luminous flux (also called degradation = gradual decrease in luminous flux)

Due to chemical and physical changes, LED modules lose some of their luminance over their service life. This degradation over the service life is denoted by the LX value, which specifies the luminous flux still reached following the rated service life of the LED modules. For example, a value of L70 at 50,000 hours means that 70% of the initial luminous flux will still be attained after 50,000 hours.

In addition to the failure rate CZ, the percentage value BY is equally decisive for the rated service life LX. The BY value specifies the percentage share of LED modules that are permitted to fall short of the LX value. A common value is B50, which means that 50% of all modules can fall short of the L70 value after, for instance, 50,000 hours.

This means that the service life of LED modules is specified in consideration of both a gradual (e.g. L70/B50) as well as sudden (e.g. L0/C10) decrease in luminous flux, which ensures both the effects of ageing and the total failure of an LED module are taken into account.

For drivers with CLO function, the decrease in luminous flux can be compensated by programming the driver accordingly.

Our partner from the USA has been developing and producing high-quality semiconductor for about 30 years. CREE has been our partner for an extensive range of LEDs since 2004. The product range includes a wide range of high brightness, high power LEDs offered in SMD as well as THT and COB technology.

Your contact: Olaf Naumann

Phone +49 (0)2842 980-211
Olaf.Naumann@vossloh-schwabe.com

Nichia from Japan, the inventor of the white LEDs, has been one of the partners of VS since 1995. The product range includes a comprehensive range of high brightness and high power LEDs, as well as a UV LED product range covering all power classes.

Your contact: Ulf Hilsenberg

Phone +49 2842 980-213
Ulf.Hilsenberg@vossloh-schwabe.com

To complement our LED range, we offer secondary optics and reflectors from our partners Carclo (www.carclo.com) and LEDiL (www.ledil.com). The product range includes a large selection of optics, optic holders and reflectors made of PMMA and silicone. We specifically stock up on a wide range of products to match the LEDs from CREE and Nichia we offer.




We develop and produce a variety of LED optics for shop, office, hall and street lighting for you. Optics are available in various designs (round, square, linear) made of high-quality materials (PMMA, silicone) and with any beam angles (narrow/wide, asymmetrical or combined).

Our partner from the USA has been developing and producing high-quality semiconductor for about 30 years. CREE has been our partner for an extensive range of LEDs since 2004. The product range includes a wide range of high brightness, high power LEDs offered in SMD as well as THT and COB technology.

Your contact: Olaf Naumann

Phone +49 (0)2842 980-211
Olaf.Naumann@vossloh-schwabe.com


Nichia from Japan, the inventor of the white LEDs, has been one of the partners of VS since 1995. The product range includes a comprehensive range of high brightness and high power LEDs, as well as a UV LED product range covering all power classes.

Your contact: Ulf Hilsenberg

Phone +49 2842 980-213
Ulf.Hilsenberg@vossloh-schwabe.com