Lumen is the unit used to determine the luminous flux and provides information about the total light emitted without considering its spread - e.g. spot or wide area. Lux, on the other hand, defines the illuminance at the brightest point, measured perpendicular to the road, at a distance of 10 metres. As with lumens, this value does not indicate how large the actually illuminated area appears. Depending on the test scenario, there may be further deviations, making a direct comparison of products based on lumen/lux values not very useful. In real conditions, NACA Road thus shines brighter than other headlights despite comparatively lower lumen/lux values, as NACA Road sets new benchmarks in distance and width of the light carpet thanks to the advanced lens system.