hlsl shaders for maya have hard-coded lights, light 1 is a directional light - lights 2 and 3 are point lights link the proper light type to the light 1, 2, 3 slots.
wretchedgoat - you need to be in Shaded AND Textured mode for the maya viewport even if you are not using any textures, otherwise your model will just show up as green. If you switch to 'High Quality Mode' the shader will also not show up. No, you dont have to have any of the slots filled in, that is one thing i dont like…