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Check the normals of the sphere / dome. Make sure they point inwards towards the scene.

have you checked your scene scale ? make sure the units and scale is correct for accurate results.
camera settings too, u might need to lower shutter speed and increase iso.

When you're converting your bitmap to mxi using the mxi viewer, you have the option to set the intensity this mxi will have when used for an emitter. There's a slider there, bottom left. Adjust it until the image is the brightness you want, you will also see the image update in the viewer.

Here you can find a suggestion from me - convert a HDRI to a dark LDRI in HDRShop and use a high intensity with the MXI viewer.

http://www.maxwellrender.com/forum/view ... 0&start=45