my first ever LED saber, and im building it.

[permafrost]

I want to run a Lux rebel star green on 4 AAAs what resistor do I need and I kno there's a resistor chart thing on the website but it only says Lux lll's and v's not rebels, so could anyone help me out here?

[Zzan]

From the Lux Rebel Product info in the store: Green 166lm @ 700mA 3.4v
4 AAA's is 1.5x4 = 6v

Taking that information and using the search function to find This Sticky
R= (6v-3.4v)/.7A
R = 3.714 ohms
Doing the math.

So you need a resistor that at least matches that to not fry your LED.

The calculator gives the same results.

But why use a resistor? Buck Pucks are more efficient. I would use the 4wire 700ma buckpuck if I were you. It's a bit more expensive but it is much more efficient.

[Sunrider]

plug your numbers into this.

http://led.linear1.org/1led.wiz