First question should be:
for that 10W LEDEngin, would you like to use all four dies or just 2 or 3 of them?
If you want to use all 4 in series, then get this one:
http://www.mouser.com/ProductDetail/...smrDjXKNib8%3d
If you want to use only 2 or 3 of them at a time, then get this one:
http://www.mouser.com/ProductDetail/...QJbVkhN3wnw%3d
Now why would you want to use "only" 2 or 3? The basic question comes down to your battery power choice and what driver are you using?
For instance, if you used two of the rechargeable trustfires (for a total of around 7-8V) you could probably drive 2 or 3 of the dies (depending on your setup). If you wanted to use all 4 dies, you would probably need a different battery solution since you would be aiming for somewhere around 10-11V.
Keep in mind that we talk about properly driving or overdriving LEDs here to get the best result - and that means that you have to make sure that the LEDs get the optimum amount of current (which in this case is at least 1000mA).
I haven't tested this theory yet and I'm sure someone else will chime in, but a single properly or over driven LED would probably be brighter to the eye than 2 underdriven LEDs... So I guess what I'm saying is that if you can properly drive or overdrive 2-3 of the dies, it would be brighter than underdriving 4 of the dies. [EDIT: you'd probably need a light meter to really tell any difference though]
*that said, even underdriving the 4 dies is ungodly bright and could potentially blind you so wear protection*
Case in point - I built a Seoul P7 saber that is underdriven, but is probably one of the brightest sabers I have ever seen.
I'm starting to ramble on now, so I'll stop... but it would help us advise you if you listed what kind of batteries you wanted to use and what driver (as well as how many dies you want to drive). I'm steering you towards the 636nm LEDs since those will seem brighter to the naked eye.
-C
EDIT 2:
I should also point out that you'll probably need to use a different driver than the stock MR board... A buckpuck will suffice for your needs, but this is going to be much more than just a simple conversion.
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