In your original post you said Sylvania...Then you got Nighthawks and said they were good...What happened?
I have GE Nighthawks. Nice and bright and no problems after returning the first set that had defective terminal attachment.
I do not have an answer for that. it just seemed that the output was not what it was when I got them. Maybe I was too optimistic when I got them.
or I am going crazy with age