When the motion sensor is turned on, the illumination time is set to 1 and n, 3 min and smin. The nighttime lighting time is set to Zh, 4h and sh. The maximum temperature of the LED is 60 ° C, 70 ° C and 80 ° C, when the temperature exceeds the maximum, the lamp is immediately extinguished. The control board is placed in the control box together with the battery and the charging and discharging device. Behind the sample lamp is an eight-story building of the university. Due to the charging of solar cells in the morning, it can only reach 12W. Due to the special focus, this solar cell is installed southward. There are no big obstacles in the east and south directions, and the charging capacity is sow when the weather is fine, and 36W in cloudy weather. Under the experimental conditions, the street lighting system works for 8 hours at night, so the next task is to solve the heating problem caused by normal (constant current) illumination, because the life of the LED will be reduced on a hot night (usually the lighting safety temperature is So °C). In order to maintain a constant illumination intensity, it is necessary to install a radiator that uses air to cool. The calculated theoretical results are compared and the experimental data is in good agreement with the theoretical curve. It can therefore be considered that the "multi-source LED lamp" theory is useful for evaluating the actual illuminance distribution. The street lamp prototype uses a highly efficient electroluminescence ultra-high brightness LED as a light source, and combines a solar cell and a battery, so that the street lamp can be illuminated at night without any external power source. The white light-emitting diode is made by coating a special yellow fluorescent substance on the surface of the blue light-emitting diode to generate white light by the complementary color effect. Polyester Cotton Plaid Fabric,Polyester Cotton Fabric,Check Fabric,Shirt Fabric 100% Cotton Shaoxing City Yongteng Textile Co., Ltd. , https://www.yongtengtextile.com