A high power lead frame LED package is a polymer-based, multi-die semiconductor emitter that builds upon the plastic leaded chip carrier (PLCC) architecture. The LED emitter comes mostly in an industry standard 5050 surface mount package. High power LEDs of this type are made to harvest the high efficacy advantage of reflector-based SMD packages. Improvements in thermal path design and the use of high operating temperature capable housing materials afford these LEDs the ability to operate at higher junction temperatures and drive currents. However, the inherent limitations in the package platform challenge their dependable performance in applications that are served by conventional ceramic-based high power LEDs and the rapidly adopting CSP LEDs. In general, high power lead frame LEDs are intended for use in controlled environments or cost-sensitive projects. Their footprint can be found in both indoor and outdoor lighting systems including high bay lights, low bay lights, flood lights, high mast lights, street lights, landscape lights, architectural and facade light fixtures, etc.