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In a literal sense, yes - shadows are the blind spots where a light source is obscured by an object, so more light sourced mean each object can cast an additional shadow.

If you omit the plural, then potentially more light means less shadow - since the shadows become generally less shaded, receiving more light overall.

However, we're ultimately talking about the metaphysical, so the definition of shadow might be more intricate (and philosophical). Are shadows about the lack of light, or about the contrast between light and dark? Does a completely enclosed room with zero light inside have any shadow, or is it that a shadow can only exist in the presence of light?