Default [Q] Kitkat Light Sensor Readings

Hi,

I was playing around a bit with the Lux Auto brightness app and noticed that the lux readings on my S4 I9505 seem a bit on the low side. every app that uses the lightsensor seems to report a very low lux reading where i expect it to be a lot higher. For example, it only reports 8 lux inside at around 7pm in the Netherlands (still pretty light outside).

The sensor and driver itself seems to be fine, whenever i look in the sysfs i seem to get perfectly sane values:
Code:
cat /sys/class/sensors/light_sensor/lux                                                                                  
251,263,170,366
(red,green,blue.white)

Does anyone else have this same issue? Or does anyone have a solution for this? Would be nice to have a somewhat bigger granularity so that i can improve my Lux profiles. I am now running Samsung stock rom for KitKit but also had it on different vanilla roms...