LED's save energy street lamp is popularized in

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led lights facing the main technical problems: the output power and luminous flux, the second optical design, thermal design and power system design. increased output power and luminous flux white led also need the extension from the high-power technology, chip technology and other infrastructure level to further improve. in the second optical design, led lambertian radiation in the form of type, side emitting, bat wing, and several concentrator. in the field of road lighting, according to lambert-type design experience and more applicable bat wing, through the second optical design, the led light range, light curves meet the needs of road lighting. led lights need to focus on cooling is one of the issues addressed, as for high brightness led lamps, heat, and the relatively harsh outdoor environments such use, if not directly lead to heat led rapid aging, reduce the stability, in addition to the power good heat-type led itself, but the street has the characteristics of outdoor use at night, in the side of the radiating surface is conducive to the air above the natural convection cooling.led message board
the optical wireless network is particularly suitable for use in hospitals and factories, because in these areas, the traditional rf transmission can interfere with navigation equipment, medical equipment or control system. in addition, led optical wireless network so that people can freely on the plane to use broadband. aircraft in real time via satellite with the ground to keep unicom, to get the internet signal. when the led light signals to the network, "according" to each passenger, there is no interference of electromagnetic waves, aircraft navigation will not be affected. led writing board
the main shortcomings are as follows: first, the luminous efficiency is not high enough: although the level of high-power laboratory luminous efficiency white led has more than 100lm / w, but mass production, cost-effective high-power white led luminous efficiency is still 60lm / w or so, energy-saving advantage has not been fully realized. second, in the face of led light reflection rate: due to the current white light led spectral characteristics, road surface and surrounding objects, reflecting their low, so low surface brightness, compared with the sodium yellow light, which is one of its weaknesses.led display board