An analysis of the the problem LED floodlights and photon lost

LED floodlights product features:
      1 wafer, the Puri chip integrated package a single 10-80W high-power LED, the brightness of the 70-80LM / W, the light fades, high brightness, good thermal conductivity.
      Aluminum alloy die casting shell molding paint handling, toughened transparent glass, the LED is directly connected with the lamp to achieve good heat dissipation purposes, light waterproof rating of IP65, corrosion, dust, water, earthquake.
      Three professional optical design with light aluminum reflector cup, high light extraction efficiency of light utilization is high. Within three seconds to start to reach normal brightness, high color rendering index, such as red, green, blue, yellow, white and a variety of colors to choose. Composed of parts: the high thermal conductivity and corrosion of aluminum heat shell, aluminum reflector cup, mounting bracket; transparent glass mask; wafer, the Puri chip integrated high-power LED light source; wide voltage constant current source.
      Application: floodlights provide illumination for the factory, stadium, docks, billboards, buildings, gardens, tunnels and other cast light and exterior decorative lighting situations.
      In the level of the existing LED lighting technology, 80% of the input electrical energy into heat, chip cooling heat is critical. The LED heat dissipation materials is the internal thermal resistance and the interfacial thermal resistance.
      Cooling base's main function is to absorb the heat generated by the chip, and conduction to the thermal resistance on the realization of the heat exchange with the outside world; reduction in the interface and the interface thermal contact resistance, thermally enhanced, is also key, so the chip and heat-based thermal interface The material selection is very important, low temperature or eutectic solder paste or silver plastic.
      White LED at this stage mainly three forms:
      1, a blue LED chip and phosphor, by the blue and yellow colors complement each other to get the white or blue LED chips with red and green phosphors, issued by the chip, blue, red and green phosphors emit optical three-color mixed to obtain white light;
      2, issued by the UV LED chip near ultraviolet excitation trichromatic phosphors to get white.
      3, using three colors of red, green, and blue LED combination light that is multi-chip white LED;
      Widely used is the second way, using the blue LED chip and phosphor, and complement each other to get white light. Therefore, such a chip to improve the LED luminous efficiency, decided to maintain the rate of the initial luminous flux and light in the blue chips.
      Radiative recombination to produce photons in the LED process, prone to loss in the outward emission losses mainly in three aspects:
      A chip internal structural defects and material absorption of photons in the outgoing interface refractive index difference caused by the reflection losses;
      2, the angle of incidence greater than the total reflection critical angle leads to the total reflection losses;
      Relatively high in the chip surface covered with a layer of refractive index transparent layer to effectively reduce the loss of photons at the interface and improve the light extraction rate.
      Therefore has a high transmittance, high refractive index, good thermal stability, good fluidity, easy to spray, with order to improve the reliability of the LED package, it requires a low moisture absorption, low-stress and anti-aging properties. And usually white LED chip issued by the Blu-ray excitation $ phosphor synthesis of light-emitting phosphor ratio of mixing needed to join in the plastic packaging, phosphor excitation efficiency and conversion efficiency is the key to high light efficiency.