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

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,

lemonie7 years ago
junits15 (author)  lemonie7 years ago
what do you mean by "different ferrite" ?