You can calibrate by using Offset bar depending on atmosphere that you are using.
The accuracy of lux is depending on your device.
It might not work when a sensor of your device cannot detect deifference of light.
1, When there is no motion as "Loading" shown in display, a light sensor cannot be detected.
Your devise might not have light sensor.
2, Depending on your devise, it cannot be majored brightness when change is little.
In that case, please cover the light sensor with your palm and make it recognized darkness and then try to major again.
3, Depending on your devise, it might take some time to major the lux level.
It has been tested by IS04(au REGZA).
This application is installed following devices
(by install statistics data);
Samsung Galaxy S2 (GT-I9100)
HTC Desire HD
Fujitsu Toshiba REGZA Phone T01C
HTC Sensation 4G
HTC Desire S
Samsung Galaxy S
Samsung Galaxy Note
v1.2 Light sensor cannot be detected. show "Light sensor cannot found."
v1.1 add "Scene" selector.
v1.0 new release.