would a 2.7 ohm 10w resistor work with the luxeon rebel star (royal blue) led?

[obi2kenobi14]

as the title states would this work? cause im on a tight budget and if i get this wrong it will be sometime before i actually get the saber done:( so if not that would the variable resistor work? thanks in advaced! bye!

[Forgetful Jedi Knight]

What kind of sound card and battery are you using?

[obi2kenobi14]

i am not useing a sound card... yet.:p but my battery is a 4 aaa battery holder with jst connector!

[Forgetful Jedi Knight]

i am not useing a sound card... yet.:p but my battery is a 4 aaa battery holder with jst connector!

It will work, however, with 4AAA batteries, you will have a very short run time.

[obi2kenobi14]

how short? and would a different battery pack help?

[Forgetful Jedi Knight]

how short? and would a different battery pack help?

Very short, and yes, a Li-Ion solution would be much better for you.

[obi2kenobi14]

would you say like... 1 hour? 2 hours? cause i got a lot of aaa/aa batteries!

[obi2kenobi14]

and how long will the li ion run for?

[Taki117]

Why not use a Buckpuck (http://www.thecustomsabershop.com/BuckPuck-1000mA-4-wire-P364.aspx)? It would provide constant current as your batteries died, making your LED brightness relatively constant as you use your saber.

[obi2kenobi14]

buck pucks are probably not the best idea in my case because i have a short saber hilt

[Forgetful Jedi Knight]

That plus you would need a 7.4V pack to run it.

[Taki117]

How short is short? If you are looking at getting a Li-ion pack anyway you could jut hot glue it to the battery, or better yet, take a look at a chassis setup (http://www.thecustomsabershop.com/Acrylic-Chassis-Disc-for-MWS-BuckPuck-S7-P767.aspx). The possibilities are quite literally endless. I too am constrained on space for my planned build (Trying to fit a pack, PC, 2 switches and a RICE port in a 7 in main body). the Chassis system will help with keeping things in place, and if you decide to upgrade later will help keep things nice and neat as well.

[obi2kenobi14]

the saber hilt is 9 and a half inches long... and i don't want a buck pack just a different battery pack (not a Li ion) some thing like a aa/aaa battery pack! (but still very helpful advice!) thanks!

[PhoenixReborn]

Why are you using such a BIG resistor for a royal blue?

[obi2kenobi14]

what do you mean big? should i use a different one?

[obi2kenobi14]

what about a variable resistor? would that work?

[Silver Serpent]

what do you mean big? should i use a different one?
10 watt resistors are physically very large. You should double-check your resistor calculations to see if you can use a smaller wattage resistor. Also note that each time you change the voltage of your battery pack, you'll need to recalculate the resistor.


what about a variable resistor? would that work?
Those are not recommended for permanent installation. They can wiggle over time with saber impacts and either dim the blade, or blow it out.

[obi2kenobi14]

ok so what resistor should i use? i was just following the whole led resistor battery pack thing that was in one of robs videos

[Forgetful Jedi Knight]

ok so what resistor should i use? i was just following the whole led resistor battery pack thing that was in one of robs videos

Review this, it helps you to answer your question:

http://forums.thecustomsabershop.com/showthread.php?17109-Tutorial-FJK-s-quot-Down-and-Dirty-quot-guide-to-Ohm-s-Law

[obi2kenobi14]

never mind guys i will just get a buckpuck and maybe a different battery.