Chad:
The light grape juice of the most popular brand has grape concentrate and water in the ingredients, as does the non-light version. I assume the ratios are just different for the light variant. The shittah that water + concentrate brands are not real gefen might be a real thing, but the differentiation between the light and non-light would be arbitrary in this regard. If one holds concentrate-based juice is shehakol, then you would say shehakol on both.
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