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The factor influencing the efficiency of LED
Aug 23, 2017

As the LED has a variety of advantages, has now become a semiconductor light source for general lighting applications an important part. For some time, LED efficiency is significantly higher than the traditional lighting technology. But how do you define the efficiency of a solid state lighting (SSL) system? In ordinary everyday language, when it comes to the efficiency of light sources, we usually refer to their luminous efficiency in units of per watt lumens (lm / W). Another measure is radiated power. Need to take into account the impact of effectiveness and efficiency, discuss the decision-making process that product developers must follow, as this will affect the efficiency of the entire system.

 

The computational function measures include determining the luminous flux (W) of the light source (lm) and the electrical input power (W). On the contrary, the corresponding amount of photometric radiation does not take into account the sensitivity of the human eye, but the pure efficiency of the measurement. The electrical input power (W) divided by the optical radiation output power (W) yields the percent efficiency. The efficiency of LEDs depends on many different factors. We will cover some of these in detail in this article.

 

The choice of color temperature has an important effect on the efficiency of lighting and can be used as a method of efficient planning lighting solutions within the framework of existing lighting regulations. High color temperature LEDs (such as 5000K) are typically more efficient (eg, 3000K) than color temperature.

 

In order to make the LED produce white light, usually use the blue LED chip. Some of these lights are converted into light of longer wavelengths (green, yellow and red) by converters or phosphors, adding all these colors together and then producing white light. However, the conversion process will be depleted, the more the wavelength of light conversion, the greater the loss, because the higher energy level (blue) light and lower energy level (red) between the energy difference is converted to heat. To minimize the loss, it is necessary to accurately calculate the absorption and emission wavelengths of the converter.

 

However, the simplification of the situation is sufficient to explain the basic principles. For example, for a warm color of 3000K, you need to convert a lot of red light. However, this requirement leads to greater losses, compared with the 4000K, reducing the luminous efficiency. For the high color temperature of 5000K, Blu-ray only need to be converted into green light, do not need to be converted to red, which is why more than 4000K luminous efficiency to increase.