The aluminum fin heat sink for plant growth lights is a low-cost solution made of pure aluminum for high-humidity and long-duration natural convection environments. Leveraging the excellent formability, light weight and high thermal conductivity of 1060 pure aluminum, combined with black anodization to boost thermal radiation and natural convection, this solution keeps the LED junction temperature below 75°C and extends the service life to over 50,000 hours (L70) in greenhouses and plant factories at the lowest cost (50% to 70% less than heat pipe solutions). It has become the most popular and proven heat dissipation solution for lighting in protected agriculture.