What bin is my Lux3?

I don't have my O-sink yet so I did some quick
low current Vf measurements.

At 2.2 mA Vf was 2.61 V
At 20.3 mA Vf was 2.82 V
At 73.3 mA Vf was 3.03 V

Is that enough info to tell what bin I have?
What I really want to know is my Vf at about 800 mA
so I can plan my resistor values.

Thanks - Greg

I test by using a small spring loaded clamp to hold the luxeon against the blade of a screwdriver. The screw driver is held by a vice. That's enough heat sinking that you can do short tests. A narow blade reduces the number of times that you short out the leads. I run it for a few seconds at a time.


The current flow is not necessarily linear, so you have to run it up to 700ma to get the Vf for 700ma.

Daniel

[ QUOTE ]
greg_in_canada said:
I don't have my O-sink yet so I did some quick
low current Vf measurements.

At 2.2 mA Vf was 2.61 V
At 20.3 mA Vf was 2.82 V
At 73.3 mA Vf was 3.03 V

Is that enough info to tell what bin I have?
What I really want to know is my Vf at about 800 mA
so I can plan my resistor values.

Thanks - Greg

[/ QUOTE ]
While there is a good chance that is a "K" bin, the correct answer to your question is No. Lux III binning is done at Tj=25C and a current of 700mA. Two emitters with identical Vf under these test conditions can have differing Vf at other test conditions.

I was afraid of that. Thanks Doug.

Greg

Got my lux3 mounted on the O-sink last night
and made some higher current measurements.

At 0.67 amps got a Vf of 3.69 volts. So it appears
I either got a K (at the high end) or a low end L.

Greg