Another option for more dramatic shadows with a mesh light is to reduce it's size/scale. As you reduce the size, the light behaves more like a point light source. The key with Lux is to think how light behaves in the real world. A very large soft box (large mesh light) will give very soft shadows, where a smaller light source, say a soft spot light (small mesh light) will give more defined shadows.

Hope this all makes sense and helps a bit.

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