Lightmap modulate problems

[xray]

I think there is a bug with lightmapping. I created a scene lighted in giles and loaded with irrlicht. In giles the lightmaps were set to modulate 2x, but the loaded scene is much brighter in irrlicht than in giles. So I tried switching the available modulates manual, and I found out that there is a difference between EMT_LIGHTMAP_M2 and EMT_LIGHTMAP_LIGHTING_M2 without any lights. EMT_LIGHTMAP_LIGHTING_M2 modulates the lightmap like in giles but EMT_LIGHTMAP_M2 lights the scene alot brighter but not as bright as M4.