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.