If you open scene in scene viewer and it looks too small or too large (for example when merging several scenes), it's because some scene formats don't contain information on units, it's not possible to open them correctly without manual adjustment.

Solution is simple - open User preferences window, adjust Import / Units and open scene again.

Lightsprint SDK itself is unit independent, global illumination does not need to know units or convert scene to meters. Scene viewer converts imported scenes to meters, to simplify merging scenes etc.