Constant Current vs. fixed voltage

I understand how the CC drivers work and have a few lights made.



Now I have a number of DC power supplies I want to use with LEDs for lighting up closets, stairways, etc.



I have a few blackberry power supplies, they are rated at 5v and max .7A.

Could I run a Bridgelux 241 (6.6 fV @ .7A) using this supply? How can I regulate the current? A resister in series? If so what kind of resistor? Are there online charts for this?



Also, I was looking for a good wire to solder with, speaker wire is too big for these little solder pads. I tried thermostat wire, but the insulation melts right off. Is there a decent 20g stranded wire I can order cheap online?



Thanks,