Help, I need a converter for my bike light.

[Lumbee1]

I built a dual CREE bike light and need a suggestion for a converter.
- Pair of CREE's in serial (~3.4Vf each) for 6.8Vf total
- Li-Ion battery pack 3.6V
- 750mA is ideal but anywhere from 600 to 800 would work as well.
- No need for dimming and I hate UI's.

I built a similar light with a Fatman that works great. I was looking for something that was set it and forget it.
The GD looked promising but it won't support anything above of Vf of 5.4.

Any other suggestions?

 

[MatajumotorS]

Why do you want to use only one Li-On? Whay not 3? I think it is easier to Buck, not to Boost ...

 

[Lumbee1]

It a VERY long story on why I am boosting and not bucking.

 

[AndyTiedye]

Adding to Bike Light Thread Index

 

[65535]

a Buck converter would give you better efficiency, but just put the LED's in parallel and get 2 750mA boards, unless there is a 1.5 amp board I am forgetting about.

 

[yellow]

does not sound like a problem: 2 emitters = 1 Lux V.
Get a Badboy or Badboy Nexgen from the sandwich shoppe.
(high possibility You have to order one suitable for Your needs --> have the fitting resistors soldered on)

Also a source for reflectors for the cree. Much better than the optics imho.
16 or 17 mm McR-XRE is what I recommend, 19 mm for more throw but a bit more tricky to mount.