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How many more times do you have to wrap a ferrite rod to achieve the same power as a toroid bead? Answered

So recently I found a neat low-voltage fluorescent driver instructable, it calls for a large toroid as its inductor, I dont have any large toroids, but I do have a ferrite rod.  What I want to know is if I have to wind 90 turns of wire on a toroid, how many do I have to wind on the rod?  I know it has to be more because the rod looses EMF through its ends.
                                                                                                                                  thanks in advance,

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