The current standard, called L70, refers to the point at which an led is able to generate only 70 percent of the light it originally produced.

现行标准l 70，指出当LED只能发出原始亮度的70%时，就算寿终正寝了。

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By utilizing the LED and light way of the instrument and employing PFM modulation, it can transmit voice from the master of the instrument to measuring point.

该装置利用光电测距仪的光源和测量光路，采用PF M调制，来完成测量主机到测量站的话音通信。

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Four Seas Oasis Indoor True Color LED display is the basic principle of light at each pixel point package of pure red, pure green, blue chip, driven by the drive system of its light.

四海绿洲LED室内真彩色显示屏的基本原理是在每个像素发光点封装纯红、纯绿、纯蓝晶片，由驱动系统驱动其发光。

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