The SilverStars you can buy at Canadian Tire are the Sylvania ones, and they are not very good compared to the Osram Silverstar (which doesn't have the light robbing coating). The Osram ones are highly rated in many instrumented tests.
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What is the difference between the Sylvania Silverstar and the Osram Silverstar?
Osram Sylvania is one and the same company, within the US they use both Osram and Sylvania, outside the US its Osram. The Osram Silverstar is a clear bulb with Xenon gas boost to increase brightness up to 50%. Color is similar to standard halogen though it is slightly whiter. The Sylvania Silverstar is the same bulb but with an amethyst blue coating with 30% more light than standard halogen and 4000K light color which is comparable to Xenon/High Intensity Discharge Light Systems as seen on high end cars from Acura, Audi, BMW, Cadillac, Lexus, Mercedes Benz, Porsche to name a few.
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If you actually want a bulb that performs well, don't bother with the Sylvania version because it's obvious they designed it for looks by adding that coating to look like HID. Any coating is going to rob the bulb of performance. If you like the look of HID, you're probably just as well to use the cheaper Cool Blues, or the Philips Bluevision at half the price.
And they aren't cheap either, at Canadian Tire the Silverstars were $22 to $29 depending on the size. Seems like a lot of money to pay for a bulb when you can buy a Philips Vision Plus that works just as well for half the cost.
Also keep in mind that that some of the "apparent" brightness switching to a blue bulb is mostly just an illusion. Read this:
http://lighting.mbz.org/tech/bulbs/blue/good/good.html
That fact is: every blue bulb on the market actually reduces light output despite that claims on the packaging.