| 摘要 |
The square roof light has one or more horizontal lamp tubes and a cylindrically-curved reflector above it directing the light downwards, together with a shade on the underside to prevent dazzle. The curvature of the reflector runs in a plans at right angles to the diagonal of the tube, and it is above the latter except for corners extending downwards. Its surface is folded along straight lines parallel to one diagonal so that between the curved portions others are situated which in all cases are struck by a ray parallel to the one diagonal and running vertically below it at the level of the lamp tube. |
