If you supply these LED modules with 9V, you can only fry them.
Come to think about it, Silver Serpent had a point there, probably the 9V battery could not churn out enough joice, so the voltage dropped. You can consider yourself lucky for that.
Use a regular 3.7V battery and these guys will be very grateful and quite bright.
As to uniformity, completely right. To compensate for that you need to etiher make a very good diffusing or increase the LED density. Or, but the same LED in the regular through-hole version (they exisst) and build a traditional LED string saber.
FoC: I was pondering on the same topic. Well, if you can detect the position of the clash, let me know, I'm all ears! That would be EPIC! In the meantime I considered a practical approach: in a duel the blade mostly get smacked somewhere close to the middle, therefore that is where the FoC has to happen. I will experiment with it, I'm sure it will look cool
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