The 'eyeball' is a lens without flutes, like bottlebottom eyeglasses. The Volvo e-codes look like your DOT's with a fluted lens, but the pattern is quite different. Fluted lenses, as found on MB's for example, do a better job than non-fluted. There are some combination lenses (fluted/nonfluted laminated together) that work quite nicely.

If money is no object, and you want whiter light, then the 6000K light would do that for you. You'll even show the characteristic blue-purple aspect flash to oncoming drivers. The 4100K will be a heck of a lot whiter than what you've got now, a little warmer, not bluish, less obvious to oncoming drivers. The numbers refer to color temperature, not light output. Above 5000K, you're tipping to the blue end of the perceived color spectrum, below that a little toward the red end. Your current halogens are probably around 2500-2800K. Either way, behind e-codes, you're in for a spectacular lighting improvement...whiter, brighter, and properly focused.
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(98 S70 T5SE misc mods, mostly lighting) (92 940GLE)