The data shows that the population of myopia in China has reached 400 million, ranking first in the world and growing at an annual rate of 8%. Among them, adolescents are the hardest hit areas of myopia, which is 1.5 times higher than the world average.
So how to prevent myopia? A factor that is easily overlooked: the choice of lighting is important, especially the desk lamp.
According to experts, the choice of eye-protection lamps on the market depends on the specific material. The illumination value is 500lx for reading. In addition, the strobe of the desk lamp is also very important. The halo is more obvious and the strobe is high. Generally, the energy-saving lamp strobes at around 482 Hz, and the LED lamp is 0 Hz. The smaller the strobe, the better the eye.
XB2-B Series Pushbutton Switch are using controlling circuit of AC voltage up to 660V/AC 50Hz.and DC voltage below 400V.It is used for controlling signal and interlocking purposes.The main body of the push buttons adopts Circuit head,with chromium plated metal bezel,Complete units with screw and captive cable clamp connections.The contact adopts special silver alloy in order to enjoy the benefit of high anti-electrical erosion.The signal lamp series are suitable for electrical applicances circuit of AC voltage up to 380V/50Hz,and DC voltage below 380V.It is ideal for using as indicating signals,warning signals,emergency signals.
XB2-B Series Pushbutton Switch
Push Button On Off Switch,Waterproof Push Button Switch,Micro Push Button On Off Switch,Green Push Button Switch
Ningbo Bond Industrial Electric Co., Ltd. , https://www.bondelectro.com