The act of lighting up or making something visible.

A period or phase leading to the introduction of light.

प्रकाश की शुरुआत या चरण

English Usage: The pre-illumination process was essential for the photographic experiment.

Hindi Usage: फ़ोटो प्रयोग के लिए पूर्व-प्रकाश प्रक्रिया आवश्यक थी।