I tried turning down the interior brightness setting, but didn't get the small light to get brighter. I put a piece of neutral density filter in it with a small blade without removing the plastic part. If you're getting the light to get dimmer by turning it down in the display brightness, please let me know and I'll see if the dealer can make it work. ND filters are something that photographers use and can be bought in thin sheets.It's controlled by the interior brightness setting, but that also drives the baseline display brightness (which you can then massage with the display settings in PCM) and the baseline ambient lighting brightness (which again you can massage through PCM the menu). I fear that turning it all the way down would make everything else too dim. Perhaps a small piece of black tape...?