Architectural Area Lighting. Castings: An important feature of any outdoor lighting luminaire is its integrity. AAL establishes a strong foundation with castings of pure, certified #356 aluminium, resulting in high strength parts with inherently superior corrosion resistance. Die cast parts are produced from #380 alloys which are brittle and have 30 to 40 times the copper content and ten times the iron content of #356 aluminum. Specify Architectural Area Lighting when you require strength and corrosion resistance in an outdoor luminaire. Every AAL product receives their state of the art finishing process which includes a five stage impingement chemical cleaning and sealing cycle, followed by a thermoset, super TGIC polyester powder finish coat. AAL finishes pass a 3000 hour salt spray test for corrosion resistance and weatherability.