I just ordered a red 3watt led from my local electronics store (what would you call it). It should be here next week. Well since i know so little i asked the guy about how i should power this thing.
He said that current limiting is more important that voltage... WHAT?
Anywho he sugested i use this:
I was thinking i could use a 3 way or 2 way switch and have like a high/low setting thing going on. Like 300ma and then like 600ma or something. the led can take up to 1a i think. Once i get the led i will see how bright i want it.
Questions: If i use a 4.8v batt pack rated at like 2500mah and set the regulator (using that resistor) at 250mah, will i get like 5hours run time, and will the led light at all? I really don't get how you can make 4.8v work on a 3.5v led, with that contraption. the guy said it should work fine.
Is he right?
EDIT: i have no idea how to read that simple formula but i think that Vref/Iout=R1 am i correct?