A recent poll of US headlight engineers rated the S2000 as having the best headlights of any car sold in the US, superior to anything from Europe sold here. Your chance of making these work better seems slight.

The status symbol of blue headlights in the US entirely confounds me. HIDs are full spectrum, produced through about the same process as the flame in a welding torch. They make much more light for much less power with a lot more dollars of hardware. Among the numerous colors in the full spectrum is blue, which for reasons that are too hard for me to understand, predominates when looking at HID headlights, especially from some angles.

Thus, in the US, people take perfectly good (for the technology level and cost) halogen bulbs and screw up their output by insisting that they must be blue coated, in order to sort-of look like HID headlights to oncoming traffic. The result is poor vision in fog or rain, unnecessary annoyance of other drivers, and about 15% less light on the road than the same bulbs would shine if uncoated. (The HID's full spectrum includes the warmer colors that the blue bulb coating filters out, BTW.) The same lighting companies that market the uncoated halogen bulbs in Europe as superior--and sell somewhat yellow-colored bulbs there for bad weather, tell US buyers that the blue color is better because it's "like daylight." My wife calls these blue-coated halogens "CZ" headlights, not to be confused with the "genuine diamonds" in the S2000.

You, OneQuickS2K, want "blue diamonds" in your S2000. They will be expensive and very pretty, but you won't see as well. Also, they will almost certainly drive the cops crazy...and what will you tell the judge?

I think this is a case of it being better not to try to improve on perfection. Just my 2