Tech Info >> Core Exchanges & Core Conversions >> New vs Used > New vs Used: The Difference Between A-condition and B-condition Picky about the quality of parts you put on your car? We are too. We've dedicated this page to the OCD-type who needs to know exactly what he or she is getting into before making that purchase. This page will show the differences between the used lights which we refurbish and recondition to "B-condition" vs the brand new "A-condition" lights. New: Obviously perfect. You'll be hard-pressed to find any flaws, if any. Used: Parts are in good working order with minor defects. Lenses may have some light blemishes in the clearcoat. Lenses may have slight yellowing, especially when compared to new. Lenses may have some pitting from normal road use. Lenses may have some light scratches that are only visible under very close observation.