Looks like it will work just fine. I stopped worrying about my setup at 75 hours. Mine by the way can be adjusted from a dim setting to the full output 50 to 75 watts depending on what you want. And you know what, it never would have happened without your starting the thread many thanks. RobC
I've bought a few 555 chips to try out your circuit too, hopefully some of these zillions of ferrite transformers I've extracted from old computer PSUs will have windings that will work unmodified. It seems a shame to dump them, and they're almost impossible to disassemble for rewinding.
I think I've worked out a method for a brightness adjustment for mine too, although it sort of defeats the whole idea behind it (low parts count (of recycled components), simple, cheap).
BTH