airwjo,
That doesn't sound like a Spectrolux Test but rather more like a Holmes-Wright.
The Spectrolux involves looking through an eye-piece at the two halves of a coloured disc and you have to turn a knob until the two halves match each other. This is reknowned as being the gold standard of colour vision testing and is ridiculously difficult to pass within JAA criteria - I have been very reliably informed that a very high percentage of people classified by the JAA as colour normal fail to meet the JAA criteria for the Spectrolux.
However, it does sound as if the Swiss are conducting the H-W test very fairly (but you'll probably find now that the UK CAA will refuse to accept their results once they've read these pages)!!!