GB 50189-2015 第2.0.6条
| | **Visible light transmittance**: the ratio of the visible light flux transmitted through a transparent material to the visible light flux incident on its surface. In hotel buildings, the visible light transmittance of exterior windows or transparent curtain walls shall not be less than 0.40 (when the window-to-wall area ratio is less than 0.40) or 0.60 (when the window-to-wall area ratio is ≥0.40). |