Chrome LUM Map Texture
The Chrome Lum Map image is 1024 x 1024 for an SX track and 2048 x 2048 for a National.
Sample CRM LUM files from selected tracks:
Grassland | Kingston Round 1 |
Lost Meadow | Manchester Round 2 |
Moto 448 | |
Sugar Ridge MX | Lago Dell Orlo (Truck map with snow) |
Chrome LUM Alpha Channel:
The Chrome Lum Map texture's seems to be critical to getting your textures to look the best that they can. The Alpha channel is pretty much a flat render of your displacement map.
Techniques:
Example Chrome Lum Alpha Channel from Lost Meadow:

Chrome LUM Main Image:
Some of the Reflex tracks don't do anything in the main image, some put quite a bit of detail. The only obvious thing at this point with the main image is that putting a white line here will put a white line on your in game texture. Putting a white line on only your Top Down texture will not display a white line in game.
Techniques:
Here is the Lost Meadow Chrome Lum Map image:
