help to drive 6x Cree MC-E with a LiPo battery

[mailint]

I need a very very powerful light for short (<1 min.) usages.

I bought:
- 6x Cree MC-E LEDS (total of 24 die)
- a (2200mAh) 7.4V LiPo (2 cells in series) battery that supports max loads of 12C (with a discharge graph similar to the attached one)

I would like to drive each die at 700mA (forward Voltage for MC-E at this mA: 3.4V) and I found this wizard to calculate the resistors and circuit that I need: http://led.linear1.org/led.wiz

Since it's my first time for such a big circuit, could some expert please confirm that I am doing the correct thing? and is there a way to use less resistors (without burning them)?

 

[Foxx510]

Lipo cells usually start at 4.2 volts off the charger, so you'd need to use that as your max voltage to calculate resistors.

Ideally though you would use a proper constant current driver circuit.

 

[Illum]

Ideally though you would use a proper constant current driver circuit.

I don't think there are constant current drivers equipped to run 6 MCEs at once....so best chance goes to pairing them in parallel

 

[lolzertank]

12 700ma AMC7135 regulators? You would give every 2 dies wired in series one of them. Actually, you could probably use 6 1400ma ones and cut a couple traces to split them into 12 700ma regulators.