Yeah, that's the diagram I started out with, but modified it as I did testing. With only 1 lux everything got really hot really quick. So instead of one luxeon I used two and found that everything still heated up but it was better. So then I threw in a big resister in with the 2 LEDs to dissipate more power and that brought down the temps to a resonable value.
Forward voltage for 1w lux is 3.4V and the 3w is 3.6V. I've done the calcs for the 1w so the problem I run into with wiring up for 3 watt LEDs is the heat. I've got twice the power going through at 700mA so how do I compensate for that? Yeah, I can run 2 LEDs, but I don't know if a big resister in series is going to be enough to keep the temps down. I'm trying to find a different circuit or IC that can handle the current and keep the temps down. I know high end flashlights use pulse modulation but that's too advanced for me.
Alternatively, a company called Cree has come out with a new LED that blows away the 5w luxeon and it only pulls around 300mA. I might have to do some experimenting with those, but they're not cheap at $15 each.
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