Here's a problem with your setup..Your resistor is too big. With a 4.8V batt. pack using a red LUX III your resistor should be a 1.2ohm 3 watt resistor. Your resistor is "resisting" too much current to the LED that's why it's dim. I also agree with Arm..The 40" blade is a bit long, that is if you are measuring from the LED itself to the bottom of the shouldered tip where it reflects. The celophane wrap, between 4 to 6 feet will also help with evening the blade.
This is also a minor issue but the blade is a thick walled blade, great for dueling but it will allow less light to reflect inside.
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