I am curious to see if anyone has used a replacement headlight bulb such as a Sylvania SilverStar Ultra on the Spyder?
I have. While the Sylvanias do emit a much brighter light than the stock bulb, I can say though that they do not last long at all. I replaced my stock bulbs back in the summer of 2011 and by mid summer last year one had already burned out. I wouldn't recommend them unless you don't mind the cost of having to replace them often.
SilverStars are sensitive to vibration, of which the Spyder has a lot of. I tried them before in my truck and was always replacing bulbs every few months.
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... Motorcycles are kind of like Baskin Robbins... You're looking at 31 flavors of ice cream, don't you kind of want to know what they all taste like?...
I used the XtraVision in my GS because they are Brighter.
If you look at the back of the package Sylvania gives you the expected Life and intensity Of the bulbs!!
Lets say a stock bulb lasts 500 hours?
The Xtravision will last 50% as long or Approximately 250 Hours.
The SilverStar and Ultra will last 25% as long or about 125 Hours.
You can see the chart below-Xtravision is darkened out.
I feel the XtraVision is a good compromise!