Stair safety lighting: Tread lighting for every step

A night scene of an indoor staircase. The sole purpose of the lighting is to prevent misjudgment of each step's position. The light source is embedded in the side wall, with one luminaire every three steps, and the light sweeps horizontally across the tread. Thus, the horizontal surface of each step is illuminated, and the front edge of the tread casts a clear horizontal shadow line on the next step, making the division between steps obvious. Looking up from the bottom of the staircase, a clear series of alternating horizontal light and shadow is presented. The underside of the handrail also has a continuous linear light, illuminating the area where the hand is placed. The staircase walls and ceiling remain dark. Avoid: Lighting from the ceiling downwards, which would eliminate tread shadows; illuminating the entire staircase as a uniformly bright surface; exposing luminaires to cause glare; or eliminating the shadow line at the front edge of the tread.

Translated from Chinese by AI.

一座室內樓梯的夜景,照明的唯一目的是讓每一階的位置不會被誤判。光源設在側牆、每三階一盞的埋入式燈具,光橫向掠過踏面。因此每一階的水平面都被照亮,而踏面的前緣在下一階投下一道清楚的水平陰影線,階與階的分界一目了然。從樓梯下方往上看,呈現一組清楚的水平明暗交替。扶手的下緣也有一道連續的線性光,手放上去的位置被照到。樓梯間的牆面與天花維持黑暗。避免:從天花往下打光讓踏面陰影消失、把整座樓梯照成均勻亮面、讓燈具外露造成眩光、消除踏面前緣的陰影線。