In-line LED 5mm straw hat

The method of improving the light color performance of LED stage lighting fixtures is based on the characteristics and shortcomings of white LED light source lighting technology. After research, it is proposed to use RGBW mixed color light source as the basis, supplemented by PWM-based color mixing algorithm control system, heat dissipation design and secondary light distribution design , So that the performance of LED basic light lighting fixtures meets the requirements of stage lighting personnel. ★The choice of LED light source For the light color uniformity of multiple RGBW color mixing technology, a simple optical combination cannot meet the light color uniformity. A breakthrough in optical technology is needed. In order to improve the performance of the luminaire, we compared the RGBW light source modules on the market in terms of performance and cost, and finally decided to use a special light source Light Emitting Diode Lamp beads. The W (white light) part of the light source selects a color temperature of 3000K and a general color rendering index Ra≥85, and the RGBW multi-color LED light source with a total power close to 300W is evenly distributed. ★Heat dissipation and secondary light distribution design "Thermal light decay" is one of the characteristics of LED devices. When the temperature rises above a certain value, the light efficiency drops sharply or the entire LED fails prematurely in severe cases. Therefore, a good heat dissipation design is a necessary condition to ensure the performance and life of high-power LED lamps Light Emitting Diode f5 In-line. In practical applications, a heat dissipation design based on heat pipe technology should be adopted. The heat pipe technology can quickly transfer heat to the aluminum fin radiator, and cooperate with the silent shaft fan to quickly discharge the heat generated during the LED operation. Since the light output of high-power LED chips is mostly Lambertian, the 50% light intensity angle is 120 degrees, which cannot meet the light distribution requirements of stage professional lamps. Stage function lamps require the control of light distribution, and different lamps have different requirements for beam angles, so the secondary optical design of the LED is required. It is mainly necessary to use optical elements to efficiently change the light intensity distribution of the LED to meet the design requirements of the lamp. For spotlights used at long distances, the 10% light intensity angle is required to be as small as about 10 degrees. For example, the surface light used in large and medium-sized theaters generally illuminate at a distance of more than 30 meters. Usually, long-focus plano-convex spotlights with very good light-gathering performance are used, which can condense light well and effectively control stray light. ★LED drive control based on PWM and RGBW color mixing algorithm Patch Light Emitting Diode. In stage applications, the stability of the lamp color temperature is very high. Therefore, according to the basic electrical characteristics of the LED light source, an accurate and efficient constant current drive method should be used to make the light output stable and reliable. . The dimming method should adopt the PWM (Pulse Width Modulation) method to ensure that the color temperature (white) or wavelength (color) of the LED dimming does not change. The comparison of color temperature changes between LED lamps and halogen tungsten lamps during the dimming process is shown in Figure 3. It can be seen that the color temperature of the LED lamps remains unchanged during the dimming process. The color mixing algorithm is the key link to control the light source dimming and color mixing and output the color light that meets the requirements. According to the basic principle of PWM dimming, changing the duty cycle of red, green, blue and white LED drive currents can change the intensity of each color light. Through the combination of different duty cycles, you can get light colors with different mixing ratios. . According to colorimetric calculations, if the determined RGB three LED spectra are used to mix white light with a certain color temperature in the range of 2300K to 3200K, there will only be a unique color mixing ratio In-line lamp holder LED. However, when only three colors of RGB are used for color mixing, the mixed spectrum is discontinuous, and there are many visible light bands whose spectral energy is 0, and the color rendering will be very poor. When the four colors of RGBW are used to mix white light at a certain color temperature, there will be an infinite variety of color mixing ratios, and each ratio corresponds to a kind of metachromatic light.