An LED luminaire comprising LED arrays, a full-wave rectifier coupled to AC mains, a power switching converter, and an LED driving circuit coupled to the power switching converter is used to replace a conventional luminaire with a severe temporal light artifact. The power switching converter is configured to convert a first DC voltage from the full-wave rectifier into a second DC voltage with a low-frequency ripple associated with the AC mains. By adapting switching frequencies to compensate the low-frequency ripple of the second DC voltage, the LED driving circuit can regulate the second DC voltage into a third DC voltage with a ripple-reduced LED driving current to drive the LED arrays with a flicker-reduced light emission to protect users of the LED luminaire from possible health hazards such as seizures, headaches, eyestrain, reduced visual performance, migraines, etc.