A single LED has low power. In order to achieve high power, multiple parallel uses, such as automotive taillights, are required, and a single high power LED is 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.
Another disadvantage of LED lighting is the spot. Due to the defects in the manufacturing process of the white LED itself and the matching error with the reflecting cup or the lens, the yellow circle problem is easily caused.
The current disadvantages of semiconductor lighting are mainly in the following two aspects:
1. The price of high-power LED is relatively high. At present, the market price of high-power white LED of 1 watt is about ten to several times that of the traditional light source.
2, high-power LED application low light efficiency, commercialized 3 watts or more high-power light-emitting diodes, low luminous efficiency, lower than the luminous efficiency of more than 100 lumens per watt of high-intensity gas discharge lamps, also less than 60 lumens per watt Rare earth trichromatic fluorescent lamps. It is said that semiconductor lighting saves power and saves energy. It is actually set up in a small power range. When using current semiconductor light sources to make high-power lighting fixtures, it does not save much energy compared with existing high-efficiency light sources. On the contrary, the initial input cost is very high. high.
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. Producing a higher temperature, and the light-emitting diode made of semiconductor material is not resistant to high temperature, and the overheating will greatly reduce the service life thereof. The heat dissipation by the heat sink increases the volume of the lamp, and the semiconductor light source has the advantages of small volume and light weight. disappear.
According to the above analysis, it is not easy to replace the traditional light source in the general illumination field in the short term in terms of luminous efficiency and price level. To solve these problems, the luminous efficiency of the luminous tube is greatly improved and the production cost is greatly reduced. However, under the current state of the art, the development of the semiconductor lighting industry to foster strengths and circumvent weaknesses, and actively develop in the direction of advantages, promoted its technological advancement and maturity of production processes, enabling the era of semiconductor lighting to come early.
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