It's because the real time lights in blitz only light on a triangle (or vertex??) basis. If the light is a static one and the model will never model, you can apply a lightmap to it. Basically a texture that has light and dark parts on it to represent the light. There are quite a few lightmappers around. Gile[s] is one. Check the User Creations Forum :)
Lighing a cube
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