TS5's directX exporter never really worked properly, from what I've read.
That's why they brought out Gamespace (even it needed milkshape to start with).
Gamespace light should work, but I think it's based on GS1.5 which I believe had some dx export issues as well.
You can always buy milkshape or fragmotion and get it in the game that way. Blender's fine for static entities, but it's got learning curve issues.
If this doesn't do it for you there's always JimB's suggestion.......
instinct is more valuable than intelligence.....