I don't know about Lightwave so much so maybe some of the guys here will be able to say, but in Maya (for example), there is a Triangulate command as well as a triangle poly counter in the polycount HUD.
If Lightwave has no such options, then figure that however many quads you have, you have double that number of triangles. So, 1000 quad faces is approximately 2000 triangles.
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