We are using a red LED ring from superbrightleds.com (AE60-R15, like the one from AndyMark but red), and a Axis M1011 camera.
The normal settings was unusable; the reflection was so bright that it was saturating and looked white.
I think I've settled on (50% is default):
Code:
Color level: 100%
Brightness : 25%
Sharpness : 50%
Contrast : 50%
White balance: Fixed Fluorescent 1
Exposure value: 20%
Exposure control: Automatic
We had the brightness as 10%, which worked great, but couldn't pick out the target from farther away.
However, you should play with these yourself, It's pretty easy to tune it live with the web interface for the camera. Look at the sample images from NI (for example, the ones in the Java sample program) for what the image should look like. Mostly black, with a *bright* target.