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Sylvania's Silverstar Ultra claims a 50% increase in brightness (over standard H7 bulbs) and 4100K (darn close to the factory HID Kelvin rating). The bulbs are not blue like many aftermarket bulbs are. I'm retrofitting Depo lights with a HID kit and I picked up these bulbs for the high beams. Haven't installed yet so I can't comment on their output. With that said, I've used the regular Silverstars in the past and found them to indeed be brighter and whiter than the standard halogen bulbs, especially when compared side-by-side.
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