An apparatus for lighting in a building structure. The apparatus includes a lighting fixture having at least two lamps. The apparatus includes a one-piece layer having a plurality of holes aligned with the respective lamps through which light from the lamps pass. A panel for a mounted lighting fixture having at least two lamps in a building structure. A method of lighting a building. A method for forming a panel. A method for forming a panel.

 
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> Method of dusting-preventive treatment of powder having dusting property

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