The LEDs have indeed an almost unlimited life. Therefore, it rather makes sense to look at how the luminance decreases over time. Our long-term tests indicate that the LEDs lose merely about 10% of their luminance after 2 years of permanent operation (17,500 hours).
To make it short: Life expectancy is no longer an issue.
Principally, we do not rely on high lux values for our lamps. Lux values are not reliable for judging the brightness of a lamp, as the luminance is only measured in one single point at a defined distance to the light source. To make it clear: the more focused the light, the higher the lux value; therefore, this value is not significant when it comes to real-life application, as e. g. a laser pointer produces an extremely high lux value, but it is not very suitable for lighting purposes.
Unlike other manufacturers, we measure the actual available light output directly on our premises. We use a calibrated integrating sphere for this purpose.