Yellowed headlamp lenses not only looks shabby, it also had a negative effect on your light power on the road in front of you and should absolutely be replaced. Nicknamed "diffusion lens", this is available in both synthetic material and real glass from SIEM. All SIEM glass comes with an IGM certificate.
SIP-TIPP: The gasket installed between reflector and diffusion lens in large and wide frames should be replaced as well.
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