Just out of interest murray, I created a 1 unit cube (Ac3d settings I normally use 1,0.1) and exported it as a .obj and a .lwo file. Loaded it into Lightwave. Lightwave tells me dimensions of the cube are 1 metre ... which is what I always assume for vrml.
However, depending on the zoom level in Lightwave, the major and minor grid changes values. So for example setting the zoom to *fit all* the cube is *2* major grid units high and wide ... but it always tells me it is a one metre object. Same for both .obj and .lwo
griff