This is my first post so
This will also be my first DIY led light so be gentle
I am planning to build a simple and cheep bike light with a one (or preferably two) Cree Q5 emiters powered by 4 NiMH AA batteries (probably Sanyo Eneloop). It has to be 4 batteries (or at least an even number of batteries) as I don't have a 4-channel charger but a standard 2x2 AA charger.
So, what's the simplest (best?) way to drive them? Can I safely direct drive the two leds in parallel with one (or better two?) resistors?
I am looking for a strong light (1A?) for a minimum of 30 minutes. As I will be building my own housing with a star emitters mounted on a small copper CPU heatsync (overkill?) heat build-up probably won't be a problem.
Would I be better off using a current regulator? I have been looking through the DX site in search of one but it seems to me that they are either not available or better suited for a higher or a lower Vcc.
What about a reflector? I would like a bit weider beam (30-60degrees?). Can you recomend such a DX lens/reflector for the Cree emitter?
Thanks! Hope to learn much from this site!