Zha's lamp is to adjust the brightness and prolong the life of expensive bulbs!
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So why not use the variable resistance slider directly to control the current to change the brightness of the lamp? It can also save energy. Have you ever thought that the shadow formed by the cascade has a negative effect on the lighting effect. Imagine the light at home. You use cardboard to block half and use the other half to achieve lighting.
The use of movable shutters to automatically adjust the brightness of the desk lamp not only effectively adjusts the brightness, but also plays a great role in protecting the bulb!
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