lexan is a type of plastic, a polycarbonate. The lenses from the vertex lights are probably made of polyethelene if I had to guess. The reason for using them rather than the oem glass ones is because the oem glass ones are the cause for a significant amount of glare and loss of intensity. They also really hurt the cutoff sharpness and colorband. If you leave your car outside all the time they will start to haze after a few years. You can always just wetsand and polish them at that point though.
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