LED flood light is a kind of solid state light source, the core of which is light emitting diode (LED). Under the forward voltage, the LED obtains the energy from the power supply. Under the driving of the electric field, the LED lamp overcomes the electric field of the PN junction and transitions from N region to P Region, these electrons recombine with holes in P region.
Since the free electrons that migrate to region P have a higher energy than the valence electrons in region P, the electrons return to the low-energy states when recombined and the excess energy is released as photons. The wavelength of the emitted photons is related to the energy difference. Ordinary diodes, in the event of electron-hole pairs recombination, due to poor energy level, the release of the photon spectrum is not in the visible range.
LED flood lights will generate heat during operation, depending on how much the overall luminous efficiency. Under the action of electric energy, the recombination of electrons and holes takes place electroluminescence. The photons radiated near the P-N junction need to go through the semiconductor and packaging medium of the chip to reach the outside. Combined calculation of current injection efficiency, quantum efficiency of radiation and external light extraction efficiency, only about 30-40% of the input power is converted into light energy, and the remaining 60-70% of the energy is mainly in the non-radiative complex lattice Vibration forms heat transfer. The chip temperature increases, it will enhance non-radiative recombination, to further weaken the luminous efficiency, LED heat control LED technology has become the focus.
LED headlamps produce a higher temperature because it is the light emitted by the lamp beads so the temperature is high need to install a cooling device to dissipate the heat will not burn the lamp beads are now on the market behind the LED flood light cooling the temperature of lamp is about the same as the temperature of the original car halogen and is driven by a ballast. Therefore, if the temperature is relatively high, the LED is much higher.