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I change them so I always have maximum brightness....I hate it when I can tell they've faded a bit.
To preserve life, I run with my foglights as DRLs, and use the headlamps sparingly.
A friend at Sylvania said if they didn't filter the SilverVision to whiten the color temperature, the output would be 40-50% over stock. Since the filtration increses heat, they have to cut the output some. They're working on trying to create a 4000K halogen that burns at that temperature, without filtration, (Hella and Philips are working on the same project).
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David \\ (98 S70 T5SE Black, misc mods (mostly lighting), red calipers) (92 940GLE)
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