The transparency in the _D texture may be messing with you on the flood light. As you look thru the render object in test game, you can see thru it.
This is a very common problem with a lot of engines. I have a lamp post with a light inside and glass enclosed, and it never works right.
I am going to remove the alpha and then try the Illumination map on it.
Alpha removed and that spot pasted the other light section on it and lightened it up.
The object not re light mapped with dynamic light.
The object re light mapped with a color of #ffffee with a 2500 range and static.
Below are the new _d and _i textures.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.