Some OEM bulbs have a plastic covering to allow the bulb to give out more of an "ambient" light. It's difficult to save the cover off the old ones, and most replacements don't have them, so you might notice an increased "glow" with the replacements. This is especially true with the backlit A/C vent dials.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car