Hi all - my first build, so apologies for the noob questions...

I'm starting off simple, a saber for my 12yo daughter. She's asked for a red LED, so here's what I have purchased from Tim so far:

1 4AAA Battery Holder with JST connector
1 Luxeon Rebel Star (Red)
1 Star thermal tape pad
1 Collimator Lens 5 deg viewing angle
1 Cree/Rebel Lens Holder

The hilt will be PVC (1" ID furniture PVC).

I'm trying to stay as cheap as possible for this first build, so I am planning on using a copper pipe end cap for heat sink, and a standard resistor instead of a driver.

From what I have learned, if I power with (3) AAA batteries, for the Rebel Star Red (2.4v, 700mA), I would need a resistor rated for 3.0 Ohm and 1.5 W.
If I power with (2) AAA batteries, that looks to change the resistor to 1.0 Ohm, .5W.

Does all that sound right? Any concerns?

Thanks!!
Tom