A single LED has low power. In order to achieve high power, multiple parallel connections are required, such as automotive taillights. A single high power LED is very expensive. Another fatal flaw in LED, low color rendering index! The color displayed under the LED illumination is not as true as the incandescent lamp, which is analyzed from the spectral distribution and is a technical problem. There is also a disadvantage that the spot, due to defects in the manufacturing process of the white LED itself and the matching error with the reflective cup or lens, easily cause the "yellow circle" problem.
The current disadvantages of semiconductor lighting are mainly in the following two aspects.
1, high-power LED devices are expensive
At present, the market price of high-power white light-emitting diodes of 1 watt is about 15-40 yuan, 20-80 yuan of 3 watts, 50-120 yuan of 5 watts, which is ten to several times of the price of traditional light sources.
2, high power application low light efficiency
Commercialized high-power LEDs with a power consumption of more than 3 watts have a luminous efficiency of only 20-30 lumens per watt, far lower than a high-intensity gas discharge lamp with a luminous efficiency of more than 100 lumens per watt, and a rare earth trichromatic fluorescent lamp of less than 60 lumens per watt. . It is said that semiconductor lighting saves electricity and saves energy. In fact, it is only established in a small power range. When using a semiconductor light source as a high-power lighting fixture, it is not a power saving but a power saving compared with the existing high-efficiency light source.
Another problem with low light efficiency is that a large amount of input electrical energy is converted into thermal energy. It is said that the luminous tube is a cold light source only that the illuminant itself is not a burning body, but the resistance heat generated by the large current on the semiconductor material still causes the luminous tube. The higher temperature is generated, and the light-emitting diode made of semiconductor material is not resistant to high temperature, and the overheating will greatly reduce the service life. The heat dissipation by the heat sink increases the volume of the lamp, and the advantage of small size and light weight of the semiconductor light source disappears.
According to the above analysis, in terms of luminous efficiency and price level, it is unrealistic for a semiconductor light source to truly enter the general lighting field to replace the conventional light source in a short period of time. To solve these problems, the luminous efficiency of the luminous tube is greatly improved and the production cost is greatly reduced. However, advances in technology take time. Therefore, in the current state of the art, the development of the semiconductor lighting industry needs to develop strengths and avoid weaknesses, and actively develop in the direction of advantages, so that the semiconductor lighting industry in the morning fast lane, thereby promoting its technological progress and maturity of production processes, making the era of semiconductor lighting earlier.
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