One who initiates a process or action.

A light source used to start an illumination.

प्रकाश का स्रोत

English Usage: The initiator light flickered before the room became fully illuminated.

Hindi Usage: जब कमरे में पूर्ण प्रकाश हुआ, तब प्रारंभ करने वाला प्रकाश झपका।