Yes Ariel, you are absolutely correct.
However the way in which we count luk is in my opinion a learnt convention, one that can be attributed to the collapse of Hindu - Javanese society, and the rise of Islam in Jawa.
You can read my thoughts on this here:-
http://www.kerisattosanaji.com/INTERPRETATIONPAGE5.html
this link will take you directly to my thoughts on luk, however, reading the previous pages will assist in your understanding of where I'm coming from.
I would venture to say that at the present time I am probably the only person in the world who holds this opinion in respect of the luk count.