Designed specifically for Peterbilt 579 (2021), this LED headlight assembly is built to meet the demands of modern semi-truck operation. Engineered with factory-matched wiring, it offers true plug-and-play installation with no drilling or modifications required, allowing for a quick and hassle-free replacement of the original headlights. Fully DOT and SAE compliant for legal road use, the headlight assembly features an IP67-rated sealed construction that delivers dependable protection against water, dust, and harsh weather conditions commonly encountered in long-haul driving. To further enhance sealing reliability, the high and low beams are designed with independent modules that adopt a sealed structure, adding an extra layer of protection against moisture intrusion and supporting stable, long-term performance. A UV- and scratch-resistant polycarbonate lens helps prevent yellowing and aging over time, while a professional-grade projector optical lens paired with premium CREE LED chips produces a clean, focused beam with a sharp cutoff—reducing glare, minimizing scattered light, and improving forward road penetration for safer nighttime driving. The all-in-one design integrates high beam, low beam, turn signal, and parking light into a single compact assembly, with independent, hermetically sealed detachable beam modules that support efficient post-sale servicing. Rear-mounted vertical and horizontal adjusters allow precise beam alignment, while an optimized ventilation design with dedicated heat dissipation openings enhances airflow, reduces light decay, and extends overall service life, making this headlight a durable and dependable lighting solution for trucking applications.