Create a probelight node (New node - lighting - Diffuse - Probelight). Now you unplug the texture map from the Diffuse color and plug it into the colorfield of the ProbeLight. The Probelight has to be connected to the Alternate_Diffuse. Set Diffuse_Color value to 0. In the ProbeLight Node set the Saturation Value to 0 and play with the Exposure value until the texture looks the way you like. You have to do that with every part of the texturemap and with every texture map you use in your scene. Delete all the lights in your Poserscene and render with the Firefly.

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