I'm pretty sure that the heat from the LED will swamp the heat from the resistor by at least an order of magnitude.
The Thanamira School of Thought Regarding Staff is:
* the total height should be 0-2" taller than you
* the blades should be noticeably longer than the hilt (at least 1", 2+" preferred)
This makes it really tricky with US sabers, since they all tend to be about 12" long - so 24" staff, with 24" blades, boom, 6' staff. Actually, more like 5'6" to 5'8" staff, due to emitter depth, so then the blades would be noticeably shorter than the hilt.
The big (small?) exception is the Menace, checking in at 10.375", so a Menace staff is ~21" long (the coupler adds 1/4", I think). I think you can get 24" blades without a req charge. Then the question is what is the emitter depth; according to
http://www.saberforum.com/index.php?topic=30372.0 for the Menace it's 3.375". 24" - 3.375" = 20.625" visible blade.
20.625 * 2 + 21 = 62.25", or 5' 2.25", which is then 1.25" taller than you. Visible blades would be 20.625" compared to a 21" hilt, so okay, pretty close!
So then the question is... would you feel awesome or weird having a Darth Maul saberstaff if you're not cosplaying Darth Maul?
Then again, this is you I'm talking to, so by the time you bling up a Menace staff, it may look totally different - and dang would I love to see photos of that!
Hope this helps.