is there any way to export fluid fx to lightwave?
No clue, but I’m guessing not.
You can export the fluid sim to to .obj files using the “Animation” option, which will export a separate .obj for each frame. I believe that you can import this into Lightwave.
this thread at Spinquad.com should cover it
http://www.spinquad.com/forums/showthread.php?t=10042&highlight=fluids