[Source: Gaogong LED's "LED Good Products" October issue (total issue 46) Wen / Qian Zongming] Since the birth of white light LED, LED application in the field of lighting has been rapidly developed, people use LED light source to create a variety of different Decorative lighting fixtures, and quickly penetrate into the field of indoor lighting and outdoor lighting. So, at what stage is the development and application of LED lighting products? What is the direction of LED lighting?
First, the efficacy of the product stage
The rapid development of LED lighting fixtures and the market has its own internal and external source power. Among them, LED high luminous efficiency and long life characteristics are the most critical factors. High light efficiency brings real-life energy-saving benefits, while long-life reduces the cost of lighting equipment. The comprehensive pulling of social needs such as energy conservation and cost reduction has prompted the rapid development and development of LED lighting fixtures.
As a new light source, L ED products also have common problems that are common in the early stage of new products. The specific performance is as follows: First, the products are not perfect enough; second, consumers are not aware of new products, and the purchase volume is low; third, the market entry costs are high. Fourth, the product cannot be batched and the cost is high. Among them, the imperfect product itself is the most important feature. There are many reasons for the imperfections of the products. Basically, people's initial focus on LED light sources is focused on the light effect level. It is believed that only high light efficiency can save energy, and only energy conservation can be recognized by the market.
To a certain extent, people regard energy conservation as the only interest point of L ED. Therefore, under the driving of market interests, there is an unscrupulous way to exaggerate the energy-saving efficiency in propaganda. In research and development, the current value is increased in violation of the technical law to increase the luminous flux of products. , showing its own "energy efficiency" situation. The bias in these concepts and practices has led to the widespread decline of functional indicators such as lumen maintenance index, illumination index, color rendering index, glare index and energy-saving indicators in LED lamps, and even more retrograde than traditional light sources.
Second, the "functional system realization stage" conversion stage LED light source lamp is a very complex edge discipline product integrating electronics, optics, machinery and so on. High-efficiency is of course its core feature, but the need for systematic technical support in order to achieve high efficacy is not at the expense of functional indicators of illumination. This requires that the product development and production must handle the following technical relationships:
First, the relationship between current and luminous flux and lifetime. The normal working current of L ED is 18mA-20mA. When the power supply current is less than 15mA, the luminous intensity of LED is not enough. When it is greater than 20mA, the heat is greatly increased, and the phenomenon of light decay, aging is accelerated, and the life is shortened. When it exceeds 50mA, it will be very fast. damage.
The second is the relationship between color rendering index, color temperature and luminous flux. At present, mainstream white LEDs on the market are made of blue phosphors excited by blue light chips, which are relatively simple to manufacture and low in cost. However, since the blue phosphor is excited by the blue chip, only the blue and yellow spectra are available, and the red spectrum is absent, so the color rendering index of the finished LED is not high. However, the red phosphor has lower excitation efficiency than the yellow phosphor, so red phosphor must be mixed in the yellow phosphor, but the yellow phosphor is pulled down by the blue phosphor after the blue light is excited, so the red phosphor can be increased. The color rendering index, but at the same time, reduces the luminous flux.
Unfinished: For the full text, please refer to the October issue of Gaogong LED's "LED Good Products" magazine.
First, the efficacy of the product stage
The rapid development of LED lighting fixtures and the market has its own internal and external source power. Among them, LED high luminous efficiency and long life characteristics are the most critical factors. High light efficiency brings real-life energy-saving benefits, while long-life reduces the cost of lighting equipment. The comprehensive pulling of social needs such as energy conservation and cost reduction has prompted the rapid development and development of LED lighting fixtures.
As a new light source, L ED products also have common problems that are common in the early stage of new products. The specific performance is as follows: First, the products are not perfect enough; second, consumers are not aware of new products, and the purchase volume is low; third, the market entry costs are high. Fourth, the product cannot be batched and the cost is high. Among them, the imperfect product itself is the most important feature. There are many reasons for the imperfections of the products. Basically, people's initial focus on LED light sources is focused on the light effect level. It is believed that only high light efficiency can save energy, and only energy conservation can be recognized by the market.
To a certain extent, people regard energy conservation as the only interest point of L ED. Therefore, under the driving of market interests, there is an unscrupulous way to exaggerate the energy-saving efficiency in propaganda. In research and development, the current value is increased in violation of the technical law to increase the luminous flux of products. , showing its own "energy efficiency" situation. The bias in these concepts and practices has led to the widespread decline of functional indicators such as lumen maintenance index, illumination index, color rendering index, glare index and energy-saving indicators in LED lamps, and even more retrograde than traditional light sources.
Second, the "functional system realization stage" conversion stage LED light source lamp is a very complex edge discipline product integrating electronics, optics, machinery and so on. High-efficiency is of course its core feature, but the need for systematic technical support in order to achieve high efficacy is not at the expense of functional indicators of illumination. This requires that the product development and production must handle the following technical relationships:
First, the relationship between current and luminous flux and lifetime. The normal working current of L ED is 18mA-20mA. When the power supply current is less than 15mA, the luminous intensity of LED is not enough. When it is greater than 20mA, the heat is greatly increased, and the phenomenon of light decay, aging is accelerated, and the life is shortened. When it exceeds 50mA, it will be very fast. damage.
The second is the relationship between color rendering index, color temperature and luminous flux. At present, mainstream white LEDs on the market are made of blue phosphors excited by blue light chips, which are relatively simple to manufacture and low in cost. However, since the blue phosphor is excited by the blue chip, only the blue and yellow spectra are available, and the red spectrum is absent, so the color rendering index of the finished LED is not high. However, the red phosphor has lower excitation efficiency than the yellow phosphor, so red phosphor must be mixed in the yellow phosphor, but the yellow phosphor is pulled down by the blue phosphor after the blue light is excited, so the red phosphor can be increased. The color rendering index, but at the same time, reduces the luminous flux.
Unfinished: For the full text, please refer to the October issue of Gaogong LED's "LED Good Products" magazine.
Power X (Qingdao) Energy Technology Co., Ltd. , https://www.qdpowerxsolar.com