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  Specifically, LED junction temperature is caused by two factors: Internal quantum efficiency is not high, that is, when the electrons and holes led sport lights recombine, do not 100% generate photons, often referred to the "leakage current" and make the PN area carrier recombination rate decreases. Leakage current multiplied by voltage is this part power, which is converted into heat, but this part does not account for the main component, because the internal photon led G9 bulb efficiency is close to 90%. Internally generated photons cannot be fully push to the outside the chip and converted to heat in the last, this is the main part, because the current which is called external quantum efficiency is ampoule G4 led only about 30%, mostly converted to heat up.Discern the quality of the LED light LED lighting is a new generation of high-tech decorative lighting, and has low power consumption, long life, impact resistance, easy to control, etc. advantage, and no mercury and sources of gas, is environmentally friendly green lighting, to meet the development needs of urban lighting, is the best choice to beautify the urban environment. 1, low-power consumption, low running costs. For the same luminous efficiency, use LED light source is more than 80% energy-saving than traditional energy sources, such as a 2000 m bridge parapet LED lights for one hour, LED light only consume 10 kWh of electricity. For one year use, it saves tens of thousands linterna cree led or even tens of millions light than traditional light sources. 2, low maintenance costs. LED lighting is stable, less demanding on the operating environment, not affected by the bad weather environmental and need frequent replacement.3, longer life. LED lamps led lights for office use solid semiconductor chip to convert electrical energy into light-emitting, plus with epoxy resin, it can withstand high strength mechanical shock and vibration. LED single tube life is 100,000 hours, lamp chip life is more than 20,000 hours, according to working 12 hours per day, its life is more than five years.4, high luminous efficiency. White fluorescent lamp, halogen light efficiency is 12 to 24 lumens / watt, and its light source all use black MyLED discount body radiation, the energy emitted only about 10% of visible light can be utilized, the rest is useless heat; for eligible one color need to filters another color, resulting in waste of energy. myledgrowupanty 20150513