I was cruising the chain auto store and seen these new Sylvania zXe. Intriguing, so I came straight home and as I tell my ol' lady, "googled that sh$t". I cant find any information on the kelvin rating or spread pattern anywhere on the net, not even on the Sylvania website. It doesnt seem like they make an H13 yet for my Fat Bob but maybe its just a matter of time. Anyways if anyone else has any information on these things, dump it here.

 

I have the H13-9008 Silver Stars in my FB and they do a great job at lighting up the night. They are rated at around 4000K color temp and are really bright and white. The Silver Star "zXe" bulbs are rated only slightly higher at 4200K, so it's questionable whether you'll see any difference between those and the regular ST.
Here's a description of the Silver Star zXe from Amazon:
http://www.amazon.com/9005SZ-Sylvani.../dp/B005HT0FVI.
Hope that helps.

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I went with the silver star, Tons of light now, and the pattern seems better! Nice and white.
And since they seem to die fast due to strength and vibration, I didnt wanna buy the "ultras" I figure if I have to spend 20bux every 2 years thats ok, but no more than that...