Solid-State Lighting With Multiple Time Delays

A light-emitting diode (LED) luminaire comprising a normally operated portion and an emergency operated portion is used to replace a luminaire operated only in a normal mode with alternate-current (AC) mains. The normally operated portion comprises LED arrays and a power supply whereas the emergency operated portion comprises a rechargeable battery, a charging circuit, an LED driving circuit, a self-diagnostic circuit, and a charging detection and control circuit. According to availability of the AC mains, the LED luminaire can auto-select to work in an emergency mode when a line voltage from the AC mains is unavailable. The self-diagnostic circuit comprises multiple timers and is configured to provide multiple sequences and to auto-test battery discharging current according to the multiple sequences. During an auto-test period, a terminal voltage on the rechargeable battery and an LED forward voltage across the LED arrays are examined with test results displayed in a status indicator.