There is a new version -
here. The performance graph off to the side provides an explanation and indicates the design performance of the filter - may assist with your question.
Reading further, the
CLS is designed for black and white photography and CCD imaging. Reading between the lines, it's not really intended for colour work. I think that's where the CLS-CCD comes in - but I have yet to see the results.
Happy to post some daylight shots for comparison - no chance of AP at the moment.