I've noticed different brightness on the LEDs from all my Premieres. It might be that the LEDs are not positioned properly behind the front panel. Although I never checked it out. I know I would prefer it to be dim rather than birght.
I wish they had several levels of brightness to choose from in the settings menu.
TiVo Mini x4
Roamio Basic OTA
53TB unRAID2--36TB unRAID3--32TB unRAID1a