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# Materials: VMap Commands {#mat_vmap}
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## vmap_lightsubdivide
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### Syntax
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**q3map_lightSubdivide <units>**
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### Overview
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Used on surface lights (see [vmap_surfaceLight (Material
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Command)](vmap_surfaceLight)). Controls
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the distance between surface generated light sources for uniform
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lighting. It defaults to 120 game units, but can be made larger or
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smaller as needed (for light surfaces at the bottom of cracks, for
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example). This can be a dominant factor in processing time for lightmap
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generation.
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