The IDirect3DViewport3::LightElements method is not currently implemented.
HRESULT LightElements(
  DWORD dwElementCount,  
  LPD3DLIGHTDATA lpData  
);
   Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in d3d.h.
  Import Library: Use ddraw.lib.