A lighting apparatus includes a board, a first light-emitting diode (LED) bank disposed on the board, a second LED bank disposed on the board, a light detector coupled to the first LED bank, and a driver coupled to the light detector and to each of the first and second LED banks. The first LED bank includes a plurality of first LEDs. The second LED bank includes a plurality of second LEDs, and is electrically coupled to the first LED bank. The light detector is configured to detect an output decay of light from each of the first LEDs. The second LEDs in the second LED bank are initially deactivated and are subsequently activated in response to light output decay of the first LEDs.