Yes. You may lower the lighting, provided there is adequate lighting to allow visual supervision of all children in the group at all times. Lighting in a room is adequate if a person's eyes do not need to adjust for the person to be able to see upon entering the room.
Source Note: The provisions of this §746.2911 adopted to be effective September 1, 2003, 28 TexReg 1402; amended to be effective April 15, 2017, 42 TexReg 1575; transferred effective March 9, 2018, as published in the Texas Register February 16, 2018, 43 TexReg 909