I googled what radiance means and the result is

light or heat as emitted or reflected by something.

Could you explain the role of "as" here? I can see no reason to put it in, as sentence without the preposition also makes sense and has the same meaning.

  • 1
    Did you look up 'as' in the same dictionary you found 'radiance' in? There are lots of different uses, admittedly, but one does fit.
    – Astralbee
    Nov 22, 2022 at 8:05

1 Answer 1


: that, who, which
—used after same or such and chiefly dialect after a substantive not modified by same or such

So, your example means light or heat such as that emitted or reflected by something.

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