Need Driver suggestion for a flashlight concept

[mobile chernobyl]

I've searched this website and read it pretty thoroughly on information regarding the C2000/C2002 LED array from Bridgelux and it seems most people either power it off CV/CC lab power supplies or TaskLED Buck/Boost power supplies. I'm going to be using a battery I seem to have an abundance of to power this - 11.1v LiPo batteries ranging at 2000mAh and up.

The newer C2002 has slightly better specs than the old C2000 and are as follows:

Vf - 16.2 (14.9-17.5 range)
DC forward Current - 1500-2500 mA

Reccomended to get 2200lm - 16.2 Vf @ 1500mA

So what I'm trying to do is find the most suitable Boost converter for this application, I'm very tempted to just buy a Boost IC and produce a small circuit on a breadboard myself - that is the preferred method because I would be prototyping quite a few of these things if all goes well.

Oh and from all the thread's I've read on the C2000 - none have found a reflector suitable for it yet... well Ledil manufactures them now. They're called the "Brooke" series and come in FWHM angles from 12 to 25 degrees. They are 45mm at the output and could easily be coupled with a 50mm aspherical lens to get some good results :twothumbs

This project is for a stationary light source for riding bicycles at night in a confined area, it is not mobile so the lights weight is not of critical concern. Burn times only need to last about an 1 to 2 hours max at the C2002's 2200 lm rating.

Thanks for any help... this site is very awesome... long time lurker!

 

[mobile chernobyl]

I hate to be the first to respond to my own thread... but this projects movin on regardless of outside input!

I've designed a compact head to mount the bridgelux in and passively cool it to a manageable temperature for it's intended application.

The entire assembly is 2" by 2". (2" dia, 2" height)

I ran a simulation on it using solidworks thermo sim. using the following values:

-Material - 6061 aluminum

-6061 heat transfer coef at 100*C = 250 W/(m2k) (most accurate value I could find)

-Bridgelux C2002 max junction temp - 100*C (using the temperature thermal load)

-Temp of air - 22*C (using convection thermal load on all other surfaces but the junction)

the hard to read temp color scale goes form 112*F to 212*F

The diagonal hole is for the feed wires to go through, it will be a 32* angle to meet the designs specs.

And complete assembly:

The current design leaves no room for a driver intentionally. These lights will be mounted and driven by a central source providing (haven't 100% figured this part out yet) appx 16.2 v at what ever parallel current requirement they will need. 2 lights will be twice 1.5A so 3A for the setup in mind.

The top section was left open and will accommodate a 50mm glass shield.

Everything is to scale as per manufacturer's spec sheets, the reflector in the assembly is Lidel's new Brooke series reflector designed specifically for the bridgelux arrays.