Let us into the high pressure solar street light. How much is 6 meters high? Sodium lamp

( 1) Compares on the service life of the LED is a semiconductor diode, light source theory of the life is very long ( Premise is to meet within the scope of the provisions of section temperature, L70 droop standards) Lamps and lanterns, but one's whole life is not simple light life, lamps and lanterns also includes lens

( 1) Life is led lamp is a semiconductor diode, the light source theory of life is very long ( As long as the prescribed temperature range L70 light attenuation standard) 。 However, lamp's whole life is not just the life of the light source, light also includes the influence of the lens. Therefore, finally the life of the lamp should be limited in all chy-tech pieces the shortest one. When the flux decay to 30%, life can reach 50000 hours, and the life of the metal halide lamp is 6000 - 12000 hours, high pressure sodium lamp life 20000 hours. ( 2) The comparison of the light illumination (1) color rendering index led white light: (1) led color temperature is 3500 - 7 million; (2) the color rendering index for 80 ~ 93. The traditional high pressure sodium lamp: (1) high pressure sodium lamp color temperature is 2000 - 2. 5 million; ( 2) Color rendering index between 20 and 30. According to the comparison results above, it can be seen that high pressure sodium lamp low color rendering index, color performance is poor, poor to color reducibility of the object itself, is not conducive to determine the depth of the surrounding environment. Led light source with high color rendering index and good color rendering performance, can restore the actual color of the object, but the white light is cold. Looking at high pressure sodium lamp, it is more close to natural light. At present, the led lamp luminous efficiency is slightly better than sodium lamp. With the development of light emitting diode technology and mature, will greatly improve the luminous efficiency of lamps and lanterns. (2) the dimming function: light emitting diode lamps and lanterns has perfect dimming function. Light emitting diode lamp light output is proportional to the current work, so can reduce the current to adjust the light. In addition, because the frequent switching of light emitting diode lamp will not cause too much damage to led lamp, so can be controlled by pulse width adjustment to dim the light emitting diode lamp, by adjusting the voltage than empty and working frequency can effectively adjust the luminous intensity of led lamp. ( 3) Light utilization rate of the luminous flux, luminance LED light loss is minimal. Different from the traditional light source, led lamp is in the form of light. High pressure sodium lamp is a glowing light between all empty, so it is necessary to a half empty between the emergent light between the direction of change for the other half empty internal reflector reflects, at the same time inevitably absorbs light and stop the light source itself. However, using light emitting diode lamp as light source in this area will not cause any loss, and light utilization rate is higher than high pressure nano light. At present, the led lamp is 65 - 100 lumens per watt, and can achieve 140 lumens/watt high pressure sodium lamp. High pressure sodium lamp spectrum on yellow, color temperature is 2000 - 2500 k, fog strong penetrability. A big problem is that sodium sodium lamp lighting continuity is very poor. When sodium lamp is working, the temperature of the lamp cavity must be more than 150 degrees, and the temperature of the led lamp is 30% of the high pressure sodium lamp. In non-working state, a lot of dust and insects is due to the negative pressure suction back, have greatly affected the sodium lamp glowing effect and service life. The light emitting diode is relatively stable. ( 4) The comparison of energy saving and environmental protection LED lights high efficiency and energy saving, low power consumption. White light-emitting diodes (leds) power consumption is only 1/10 of incandescent lamp and energy-saving lamp of a quarter. The light emitting diode lamp light source does not contain harmful metallic mercury. High pressure sodium lamp light source contains metallic mercury and sodium metal ( After electrify the mercury vapor and sodium vapor) , short service life ( Compared with the light emitting diode) And subsequent disposal of environmental pollution. Leds lamps and lanterns is good shock resistance, convenient transportation. Solid-state encapsulation belongs to cold light source type. So the transportation and installation is very convenient.