Sylvania's response...
So I was curious as to the exact diff. between the "osram silverstars" and the "sylvania silverstars" so I wrote the C.S. dept. an email. this was there response... hope it is informative if anything....
"Good Morning Scott,
Thank you for taking the time to contact us with your inquiry. There is
a difference between the OSRAM SilverStars and the Sylvania SilverStars.
The Sylvania (North American) SilverStar bulbs have an amethyst blue
coating to help give the whiter light appearance. The European (OSRAM)
SilverStar does not have this coating; their light is more yellow, like
the SYLVANIA (US) XtraVision product line. Both products offer greater
luminance (increased brightness) when compared to standard halogen
products.
I don't believe you will be able to find OSRAM SilverStar lamps at
retail locations here in the United States. We don't recommend that you
use the OSRAM SilverStars simply because government regulations in the
US and Europe differ dramatically, and you may find that you're
operating lamps that are not DOT compliant.
For more information on the OSRAM SilverStars, please visit
http://www.osram.com/osram_com/Consumer/Automotive_Lighting/Products/Hea
dlights/SILVERSTAR.html. For more information on the SYLVANIA
SilverStars, please visit
http://www.sylvania.com/ConsumerProducts/AutomotiveLighting/HighPerforma
nce/Silverstar/FrequentlyAskedQuestions/.
Sincerely,
Heather
Consumer Care Specialist
OSRAM SYLVANIA, Inc.
1-800-729-3777"