science help please how is light like a wave?

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I would like to ask the master to sell LED ceiling lamp, two lines are not divided into FireWire, zero how to connect security?

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How to configure solar garden lamps?

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Why do you want to turn left and right

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Does the fluorescent lamp ballast have radiation?

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Seeking the production process of LED bulb... Thanks

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Computer shake head lamp and LED shake head lamp, which good?

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DMX512 how can you shake the head light?

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The LED lamp has low voltage and has the function of explosion proof lamp itself

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Excuse me this kind of lamp chimney is broken what should affect beautiful

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Clothing store, LED lamp used to burn more than a year, what's the matter

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What about the size of the led light?

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recessed lights?

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What tests do LED lamps need be tested?

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LED how does the bulb return electricity?

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Dome light size 2013 mazda 3?

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230W's beam light is out of control

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Can you explain the light-year in hours?

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How do I get the four joints of the LED fluorescent tube

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What kind of voltage does a professional stage light require?

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Where are the plant lights? How much is the phone and what is the price?

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Want to take a lamp, put the chandelier unloaded, found three lines, how to pick up?

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Does a fluorescent lamp change an led light to change a light tube only?

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lighting for Russian tortoise confused?

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What are the advantages of LED track lamp?

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Precautions for LED grille lamps

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How much is traffic safety?

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What is refraction of light?

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Does LED's white light allow photosynthesis in plants?

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How to choose LED courtyard street lamp?

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