'light-based' originates from the combination of 'light,' meaning 'the natural agent that stimulates sight and makes things visible,' and 'based,' meaning 'having as a foundation or starting point.'

'light' and 'based' have been used in English since the Middle Ages, with 'light' coming from Old English 'leoht' and 'based' from Old French 'basse.'

Initially, 'light' referred to natural illumination, and 'based' referred to a foundation. Together, they now describe technologies or methods that rely on light.