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The "square" headlights on the 99 were all H-4 halogens. They did not come as a sealed beam. American lighting laws dating back to the 1930s, when lighting technology was extremely primitive, required that all headlights used on the highway were to be sealed beams. Lights prior to that law had suffered from rapid deterioration of the reflectors and didn't seal out water. By the time the 99 came along, European halogen technology had advanced to the point that Americans, who bought cars with round lights that were equipped with H-4s in Europe, were being forced to use inferior lights because American sealed beam technology was not as advanced. We did eventually start getting sealed beam halogen bulbs, but they are still of inferior lense design. The new lights in American cars, developed by Sylvania and GE, have sealing rings around the replacable bulbs but are not sealed beams in the old sense. Eurospec lights are still vastly superior in the areas of lens technology and beam control.
Americans still don't make lenses that are worth anything. In fact, in restoring lighthouses on the Oregon Coast, companies have gone to the original French producers of the fresnel lens prisms because American companies can't make them to acceptable quality, and they don't even have ovens big enough to make some of the larger ones.
Another thing about the Sylvania/GE design is that they use a different plug design, so the wiring has to be modified to put Eurospec lights into a car that has the US lights.
Technically, H-4 halogens of the past, and today's Eurospec lights are not supposed to be used on the highway in the United States. American lighting laws, though no longer requiring sealed beams, are designed to protect the inferior lens designs of American companies by requiring the US bulb design and disallowing the better European design.
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