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Thanks again for the helpful tips, that got this project finished. I ended up going with the design I mentioned in a follow-up post....3 strings of 4 LEDs each, wired in parallel, with a 270ohm resistor, powered by two 9-volt batteries.
Here are the pics for my Flux Capacitor on FB: https://www.facebook.com/ukcat/posts/10155547742687197?notif_id=1530370274090677