More correctly, whensoever. Rev., when. Whether in my incarnation, or before my incarnation, or after it. Compare Joh 1:4, Joh 1:10.
The light
See on Joh 8:12. The article is wanting. Westcott says, “Christ is 'light to the world,' as well as 'the one Light of the world.' The character is unchangeable, but the display of the character varies with the occasion.”