I read about folks trying this a while back. It seems it would be good to update the tired yellow lighting with nice bright white lights. But as far as I know, they can't be dimmed. Any updated experiences with these?

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma