One of the design criteria for a conventional housing is to prevent injury to the user or to prevent starting a fire. Traditionally, only enough cooling is provided to keep the body of the housing at a user-safe level. Therefore, high internal temperatures are common with such fixtures. To operate at a temperature that supports LED longevity, an LED fixture must provide a direct thermal path to conduct the generated heat efficiently to the surrounding ambient air. This is accomplished by designing a large cooling surface area for heat radiation and conduction. This approach is fundamental to ALLED fixture designs, as will be addressed later.
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