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The width should not be less than 50 cm.
Otherwise, the width is too small, the thickness is large, and it looks bulky.
Or add a circle of plaster line to close the mouth.
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It may not look good to make, so it is recommended to do this:
1. The first layer of the top of the light strip, the second layer does not leave the light trough, the distance between the light trough and the top surface of the first layer is as large as possible, and the two layers of the ceiling are all edged with gypsum lines, which belongs to the European-style square.
2. The most common two-layer light trough, each layer of 5 cm light trough, 5 cm baffle 3, changed to a single layer, at present, it is relatively simple and fashionable.
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If you install a light strip, 22 cm is enough, 100mm is the light strip baffle, and 120mm is left blank.
If the top surface of the secondary ceiling is 45 cm, it should be this width.
In mutual. Multiply and divide to know the area. Or let a professional handle it for you.
15 height is sufficient, of course, it can also be adjusted appropriately, mainly for aesthetics, or according to the elevation to judge.
The room is big and suitable, but the kitchen and bathroom are certainly not suitable. I hope my answer can help you.
The first level is about 100-200, and the hollow-shaped ceiling is generally about 400 wide, and downlights can be installed. The width of the light trough is 50-100