I have the same problem with my IXEG737 Version 1.07 . Before you ask : I don't use terra haze, or any other plugin like that.
The DataRefEditor shows for example : ixeg/733/lighthing/light_main_pilot_side=0.105330 with the knob turned fully bright.
If I change the value to 0.9 the light is perfect, but its anoying to change the light setting every time manually.
Any idea ?