1. The upper and lower two plates with plastic material, the middle to be hollow (too thick to do solid). What color do guests need?<br> <br>2. 2 groove depth measurement of 1.5mm, if the LED light is installed in it, the depth is not enough (see annex picture)<br> <br>3. What are the requirements for the brightness of LED lights and what color? What are the requirements on the power supply (what is the voltage?) DC or AC? )
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