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Question:

Excuse me, 5 inch downlight standard hole size is the number of

Excuse me, 5 inch downlight standard hole size is the number of

Answer:

According to size: 2 inches; 2.5 inches; 3 inches; 3.5 inches; 4 inches; 5,6,8,10 inches. An inch refers to the diameter of the reflecting cup inside.
The lamps produced by each manufacturer are different, and the opening sizes will be different. If the standard of the product, the opening diameter 135-145MM is ok.
If the standard of the product, the opening diameter 135-145MM is OK

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