‘Le siècle des Lumières [plural] … Le terme de «Lumières» a été consacré par l’usage pour rassembler la diversité des manifestations de cet ensemble d’objets [la superstition, l’intolérance, l’abus des Églises et des États].’ (fr.wikipedia.org) — Except for Postmodernism, an era does not usually give itself a name. The term was coined later on (say, just about the acme of the revolution’s Terror, when a cult of such lights/gleams/luminaries was contrived). Where in German it reads ‘Aufklärung’, in French ‘éclaircissement’ is used instead.

First words of the Bible: בְּרֵאשִׁית, בָּרָא אֱלֹהִים, אֵת הַשָּׁמַיִם, וְאֵת הָאָרֶץ. ‘In the beginning God created the heaven and the earth.’ (Gn 1,1) — Okay, the third verse reads, in French (Bible de Sacy translation): ‘Or Dieu dit: Que la lumière soit faite. Et la lumière fut faite.’ — Not a plural.

The angel of the light = Lucifer (<Lat. ‘light-bearer’); cfr 2 Cor. 11:14: ‘And no wonder, for Satan himself masquerades as an angel of light.’ — I don’t believe Kant could ever have imagined him being associated with satanism…