I'm not sure Australia is relevant, but the Australian Designated Aviation Medical Examiner's Handbook, section 2.1.15, spells out the specifics for color vision for an Australian medical.
http://www.oaansw.com.au/visionstds/...on_Section.pdf
I doubt one will have any success at all making an appeal for a failed test based on "I wasn't informed." The standard is very specific regarding medical qualification and testing with regard to color vision, and on the tower light test, only one attempt is allowed day and night. If the tower light gun test is failed, then it blocks any additional testing, and the failure cannot be retracted.
