You seem to be unable to let this go, so I will quote again the regulations under which I operate here in the state of New South Wales Australia.. (As an aside, I repeat that having red and green nav lights on a kayak is a negative in my opinion because (a) they will be too low to be visible in anything but millpond conditions, (b) their presence could give you a false sense of security due to (a) above, and (c) they might give another vessel the false idea that you have the ability to manouver quickly.
Quote from the Boating Handbook 2011-2012 Page 49
Sailing vessels of less than 7 metres in length, or vessels being rowed, should if practicable exhibit the lights required for sailing vessels over 7 metres.
If not they should have ready use of an electric torch or lighted lantern showing a white light which shall be exhibited in sufficient time to prevent collision
My italics. It DOES NOT say that the light has to resemble a torch, that is entirely your own creation. So my all round masthead light complies 100% with the regulations both I and Kayakingbob have quoted (it would appear these are consistent because they are in fact international regulations). You also seem to believe that the white light is somehow illegal if it is at a masthead, but again, this is entirely your own creation, as it is not mentioned in the regulations elither.
Should my alround masthead light be insufficient to warn "some idiot blundering about", I will also shine my torch to light up the sail. Oh, and BTW, if you are in danger of being run don from behind, the ONLY light you will be showing, even if fully complying to your interpretation, will be a single white light, just like mine. The regulations offer zero requirements regarding the height of a stern light....