Texels per unit are always approximate anyway, since UV layouts can't be stretched, and atlases have resolution limit, so both Enlighten and Bakery may differ in rounding rules they apply. Perhaps the best way to compare the two is: - Check Baked Lightmap visualization in scene view - you'll see checker pattern on surfaces, this is the one used as texel size for Enlighten/Progressive. - In Bakery window, go to Advanced Settings -> Checker Preview -> Show Checker. This will show Bakery's texel size with current settings. Compare the two. Are they significantly different? It is. With Lightmap Groups the resolution is selected manually in the group object. Scale in Lightmap will still work to balance relative size of objects in the atlas. All objects will be normalized to atlas size (or at least that's how it should work). The lightmap shouldn't have any large empty holes.