Which converter? 3.3Vf Cree with 3.7V Li-Ion battery

[Lumbee1]

I am building a Cree bike light but I need some help with choosing which converter to use.

The P4 cree has a Vf of 3.3 to 3.9. The battery pack I would like to use is 3.7V Li-Ion. I know that I could run two Cree's for a higher total Vf and then choose a boost converter, but I would like to keep this as small as possible.

I already have a Fatman for another dual Cree bikelight.

 

[soffiler]

I am building a Cree bike light but I need some help with choosing which converter to use.

The P4 cree has a Vf of 3.3 to 3.9. The battery pack I would like to use is 3.7V Li-Ion. I know that I could run two Cree's for a higher total Vf and then choose a boost converter, but I would like to keep this as small as possible.

I already have a Fatman for another dual Cree bikelight.

How about this one?

http://theledguy.chainreactionweb.com/product_info.php?cPath=48_49_61&products_id=920

 

[Lumbee1]

How about this one?

http://theledguy.chainreactionweb.com/product_info.php?cPath=48_49_61&products_id=920

ah... thank you. that looks exactly like what I was looking for.

Output adjustable: Set by two SMT (0603) resistors.
Do you have any experience with the GD500 and how to set the current output?

 

[Icarus]

Wiz2, GD or Flupic if you need more levels/features.

 

[soffiler]

...Output adjustable: Set by two SMT (0603) resistors.
Do you have any experience with the GD500 and how to set the current output?

Personally, no, I don't have experience with the GD. But as I understand, the GD500 comes pre-set for 500mA output. If you look at the GD-blank instead...

http://theledguy.chainreactionweb.com/product_info.php?cPath=48_49_61&products_id=961

...here you'll see a link for a resistor calculator, pricing for each resistor, and a fixed charge of $3 to solder those resistors.