Highest Vf Cree seen?

[Stereodude]

What's the highest Vf Cree (at 1A if it matters) that anyone has seen? :thinking: I'm trying to design a driver, and I need to know about what the highest Vout the circuit could have to drive.

Thanks! :twothumbs

 

[jtr1962]

Looking over my test data, I've got a range of 3.30 to 3.61 volts a 1 amp. This is measured directly at the LED pads. Don't forget that there will be a little extra voltage drop for wiring/PCB traces. I'd say if you design for 4.0V you're completely safe. 3.8V should cover you the majority of the time.

 

[Stereodude]

Thanks!