You need to make a light map and link it to a main texture file that has already been applied to an object within Gmax. Just go to the materials editor link the light map via the "illumination" option but make sure the box is unchecked while keeping the "diffuse" option checked. In a nutshell, it should appear like the following in the editor:

---------Material Editor----------
-------------Maps-----------------
<Checked> <Diffuse> <main_texture_t.bmp>
<Unchecked> <Illumination> <main_texture_l.bmp>

Notes

Notice the suffix letters in each file. The "L" in the second bitmap tells FS that the particular texture shall be rendered as a light texture that blends with the main texture. Also don't forget that both textures must have the same proportions since one will blend in with the other.

As for the whole <checked> and <unchecked> thing, don't ask why because I don't know honestly. For some odd reason it seems to work for me that way. But if you like you can try and <check> the <illumination> box just in case it works as well.

After all is set, make sure that all textures are converted. You can leave the light maps alone they seem to work alright in there normal formats. Please note that illuminating the panels requires a different method since active gauges are involved.

I hope this helped and good luck.

Hey Katahu. I tried your method but could'nt get it to work. I may have been doing it wrong. But I found if I exported with lightmap unchecked in make mdl.exe that it takes care of the problem. My lights still function correctly and my reflections are not transparent when I turn them on. This way I do'nt have to add any additional maps. Just wanted to update my findings for you and anyone else who might read this thread who may be having the same problem. Thanks Greg.

Cosmotic They both have to have the same name for example Fuselage_T.....Fuselage_L the reflecting alpha map which you already convert it,have to have at least 128x128 gray map with the same name only the Suffix _T..._L makes the different............
   
     Hope this helps

Hey Alrot. Yeah I think my problem was that I was using a 1024 bmp. Main texture with many parts on it and used a copy of it with the _L replacing the _T. This caused the whole texture on the part to light up. I still was unable to get the reflect to work correctly with Katahus method but I'm planning on doing some more experimentation with it later.