Hate to take away from this thread, but given that these bimmerlights are hard to come by anyways, there seems to finally have been a fix found for this issue using Bimmercode.
See
post in this thread by imdiekeb.
Here are his instructions which also worked for me:
Using BimmerCode, I made the following code changes with very acceptable results:
Headunit - 3005 APIX_CID_UND_ZIN - DIM_CURVE_X2 – change values to 0x00, 0x00 (from 0x1F, 0xC0)
Instrument cluster - 3000 Anzeige_Konfiguration – DIM_TAG_NACHT_LICHT_EIN_ENABLE – change value to aktiv
Instrument cluster - 3005 FuBi_Parameter – DIM_DTN – change value to 0x7F (from 0x3F)
After programming the codes above, go to Car/Settings/Displays/Control display and change the “Brightness at night” to it’s lowest value. Then use the standard I.P. scroll wheel to set a comfortable light level in darkness.