a system and method of managing light energy are provided . a detecting apparatus detects input information related to input light energy and environmental information related to efficiency of inputting light energy . then , an analysis and management apparatus calculates , analyzes , classifies , manages or optimizes the input information and environmental information by predetermined parameters or rules , and determines whether to take a corresponding action according to results of analysis or management . accordingly , drawbacks of prior arts , that the source of light energy cannot be handled accurately and difficulties in controlling and optimizing light energy persist , can be solved .