Everyone! Why is this correct:

There was someone in the house because there was a light on inside.

As I know, light is uncountable. So correct to say the light/ light but not a light, isn't it?

  • Now I see ) But now I am confused with another meaning: We would like to shine a light on this question. In this case a light isn't a lamp but still they use " a". I would write "to shine light". Jun 20, 2020 at 9:37

1 Answer 1


In this case a light means literally one single lamp, so the use of a is quite normal.

You seem to be assuming that the author is referring to the output of a lamp, which is indeed 'uncountable' but that is not what was intended.


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