There are two types of innovation: demand-driven and te […]
There are two types of innovation: demand-driven and technology-driven. Where will LED as the latest light source technology push lighting?
The light source is the source of the illumination. For a long time, the application of light sources by human beings was mainly reflected in natural light, which gave birth to many great architectural cultures and will not be discussed. As far as artificial light sources are concerned, they have undergone the three major stages of light-fire homology, light-temperature homology (black body), and then photon theory. In the homogeneous stage of light and fire, the main task of lighting is how to burn the fire more vigorously. The ancients innovated by finding more flammable pine branches instead of ordinary wood. After the discovery of oxidation, the innovation was mostly to mix oxygen into combustible materials. The gas lamps on the streets are a good testimony of the pioneers' efforts. With the further development of the knowledge, the separation of light and fire, and the familiar Edison, experimenting with high temperature resistant materials to improve the life of the light source is the historical mission of that generation of lighting people. Generation theory generation technology generation products, under the background of photon theory, fluorescent lamps, metal halide lamps and great LEDs were born, why are they great? Because this is the first time that humans have not obtained high temperature to indirectly obtain light, and for the first time realized electrons from electronics. There is no intermediate state transition to photon. The benefits are obvious. The reduction of the middle level means high efficiency. Today's LEDs, the efficiency of 160lm / w is no longer high-tech. As far as its theoretical limit is 355lm / W (external quantum efficiency is 100%), it is both ascending and has a long way to go; bypassed This link of high temperature has also brought about a significant increase in the life of the light source; fluorescent lamps need to be slowly turned to the brightest, metal halide lamps need to start up time, all stemming from the time required for temperature rise, and the LED lights up in milliseconds; the drop in temperature, The reduction of devices makes the volume of LEDs significantly smaller.
The summary features are as follows: 1. High efficiency; 2. Long life; 3. Low temperature; 4. Quick response; 5. Small.
Efficient and longevity will continue to develop, but not the main battlefield. Because of economics, the benefits of further improvement in light efficiency are limited, and the combined life-span requirements (decoration period) are basically met, and the difficulty of technological breakthroughs is increasing. The need to meet the needs of the accompanying upgrade, more and more places, no longer simply emphasize light efficiency, but where to have light-precise light distribution, what kind of light-color rendering index, color temperature, full color gamut Indexes, color tolerances, light spot morphology, excessive light spots, main and auxiliary light spots, and glare have put forward higher requirements.
The response is fast, and the lighting products themselves are energized at the same time as the electronic devices are turned on. The grid-based features combined with the hot Internet of Things will also promote product upgrades.
Combined with low temperature, small. The industry has made many innovations, but it is not enough. The form of LED lighting products is not essentially different from the traditional era. Its characteristics make lenses (reflectors in traditional times) the main light distribution tool. But the volume and form of the lamps have not come out of the shadow of traditional lamps. This will be one of the most important breakthroughs in the development of LED lighting. The characteristics of low temperature allow more materials to play a role. The small size makes the lamps diversified and more flexible in use, but also puts forward higher requirements. , Such as: concealment-see the light but not the light; homologous diversity-the same paragraph with more light. All call for miniaturization and modularization of products, and the smaller the light emitting surface, the better, so the evolution direction of miniaturization should be flat.
Tracing the source and tracing the four development directions of LED development: one, light quality, two, flat, three, modular, four, intelligent
02 LED Lighting Challenges
The long-life and high-efficiency of LED light sources basically meet the requirements, but challenges still exist, and the system life is limited by: power supply life, process stability of multiple devices and solder joints, temperature, and so on. Reducing glare, optimizing light spots, and eliminating dispersion will greatly reduce light efficiency, resulting in low system efficiency. Stadium lighting and other fields are limited by temperature management, and the system power and total luminous flux are still low.
In terms of light quality, the challenge is even greater.
The small size of the LED places higher requirements on the entire lamp process. Mainstream lenses, especially small beam angles and small volume lenses, slight assembly errors may cause sharp deterioration of light distribution