A method for controlling a color temperature of light emitted by a plurality of light-emitting diodes (LEDs) comprises steps of a controlling device entering a transition mode upon receiving a tuning signal from an input device, the controlling device generating a modified signal based on a received electrical signal according to the tuning signal, the controlling device outputting the modified signal to a lighting device, and the controlling device entering a normal mode once a predetermined period of time has elapsed since the last time the controlling device receives the tuning signal.