Time Lux - online utility on ToolBox.
Battery energy Wh = (capacity/1000)·voltage×0.8; single-lamp duration = Wh/power; lamps needed N = ⌈area×lux/(lumens×utilization)⌉; system duration = Wh/(N×power).
根據電池容量與燈具引數計算消防應急照明的持續時間與所需燈具數量,用於應急照明系統配置與供電校核。