A lighting device includes a lighting module, a storage module storing light data sets corresponding respectively to successive time points of a cycling period, and a processing unit. In a routine mode, the processing unit controls the lighting module to emit light and to successively change color of light at the successive time points of the cycling period. In an adjustment mode, the processing unit reads from the storage device one light data set corresponding to the time point indicated by a time signal from an input device, adjusts the light data set according to a color signal from the input device, and controls the lighting module to emit light based on the adjusted light data set.一種燈光控制系統包含輸入裝置及一燈具。該燈具電耦接該輸入裝置，並包括一發光模組、一儲存單元及一處理單元。該儲存單元儲存有多筆分別對應多個時間點的光色設定資料，該等時間點以一輪放期間為一個循環而具有一預定順序且彼此以一預定期間相間隔。該處理單元工作在一輪放模式時使該發光模組依照該等時間點的順序逐次發出分別具有該等光色設定資料所對應的特定顏色的光線。該處理單元工作在一時點調色模式時，根據來自該輸入裝置的一指定該等時間點其中一者的時點信號及一設定信號，將對應的光色設定資料調整至與該設定信號並控制該發光模組發出具有該光色設定資料的顏色的光線。
