Development of LED lighting lamps to indoor lighting products

The Internet LED lighting market has huge business opportunities and broad development space. The application of LED lighting lamps has developed from outdoor landscape lighting LED to indoor lighting application. According to analysis, the development of LED Indoor lighting will have an exponential growth trend in the next five years. In 2011, its output value will reach tens of billions of dollars. In particular, the EU took the lead in implementing the plan to ban incandescent lamps in 2009, and the issue of energy conservation has attracted much attention, creating huge market opportunities and optimistic prospects for LED indoor lighting. The development of high-power LED lighting depends on two elements: one is the chip itself; The second is lighting technology, including heat dissipation, optics and driving. The first is the chip. At present, the key to the development of LED chip technology lies in the substrate material and epitaxial growth technology. Substrate materials have developed from traditional sapphire materials, silicon and silicon carbide to new materials such as zinc oxide and gallium nitride. Whether it is a high-power chip for focused lighting and overall lighting, or a low-power chip for decorative lighting and some simple auxiliary lighting, the key to technology upgrading is how to develop more efficient and stable chips. In just a few years, LED has made great breakthroughs in light efficiency with the help of a series of technical improvements including chip structure, surface coarsening and multi-quantum well structure design. Thin film chip technology is the core technology in the production of ultra-bright LED chips. It can reduce the light output loss on each side and output more than 97 light from the front with the help of the reflection surface at the bottom. This not only significantly improves the luminous efficiency of LED, but also creates superior convenient conditions for lens design. In fact, since the development of LED lighting lamps, people have been paying attention to its service life. If only using LED components with low thermal resistance fails to build a good heat dissipation system for lamp devices, however, only by effectively reducing the thermal resistance from the PN node to the surrounding environment can the PN node temperature of the LED be greatly reduced, and the goal of prolonging the service life of LED lamps and increasing the actual luminous flux is successfully achieved. Unlike ordinary traditional lamps, printed circuit board is not only the power supply carrier of LED, but also the heat dissipation carrier of LED, so the heat dissipation design of heat sink and printed circuit board is very important. In addition, lamp manufacturers must also consider factors such as the quality, thickness and size of heat dissipation materials and the handling and connection of heat dissipation interfaces. In terms of optical design of LED lighting lamps, compared with traditional lamps, orientation and point light source are the typical characteristics of LED and the key points of optical design of lamps. Through the binary optical design of LED, LED lamps can achieve better light distribution curve. Just as the light of indoor lighting with large LED lighting market needs to be very bright at present, high light transmittance lampshade can be used to improve light extraction efficiency. Or the light guide plate technology is applied to the lamp, thus changing the LED point light source to the surface light source, which can not only improve the light distribution uniformity of the lamp, but also prevent glare. It can also be used with some condensing lenses or reflectors to highlight the condensing effect of illuminated objects to achieve real ideal optical effects. The technical challenges of high-power LED lighting, even though LED has achieved satisfactory performance in indoor key lighting and decorative lighting applications, it still faces many challenges in general lighting and atmosphere lighting applications, including initial cost, light efficiency when color temperature is low, color rendering index and system reliability, etc. Cost is a relatively sensitive factor in indoor lighting, especially in home lighting applications. Although there are more and more LED lamp models and the luminous efficiency is constantly improving, the problem of high price still exists. However, when the price of LED light source decreases and the overall design of the system is optimized, the total cost will inevitably decrease. When LED lamps increase the light efficiency at low color temperature, the low color temperature below 4,000K is usually indoor home lighting. Warm white light makes the whole environment warmer and more relaxed; The cold white light gives a clean, efficient and bright feeling, which is more suitable for office and outdoor lighting. LED lamps can prolong the service life and improve the reliability of the system. In general lighting applications, the overall efficiency, service life and reliability of LED must be improved through system optimization. LED light source: compact and efficient, with a variety of colors and output power to choose from. Power Conversion: efficiently convert alternating current, batteries and other power supplies into safe low voltage and constant current power supplies. Control and drive: use electronic circuit to realize constant current drive and control of LED. Thermal management: to achieve a longer service life, it is very important to control the temperature of LED nodes, and heat dissipation analysis is also indispensable. Optical elements: Lens, reflector or light guide plate material is a necessary optical element to focus light on the target area. With the rapid development of LED technology and the gradual improvement of LED luminous efficiency, the application of LED will be more and more extensive. Especially with the increasingly serious shortage of sexual energy, people are paying more and more attention to the development prospect of LED in the lighting market. LED will be a potential light source to replace incandescent lamp, tungsten lamp and fluorescent lamp. In addition, in the design of indoor lamps, LED will tend to be energy-saving, humanized and artistic.