V3U &1.2 A should be brighter than 150 lumens ?

so at a current of 1.2-1.4 amps with 9V forward V.

I should be over the 147 mark correct?

at what current does the BIN get determined at?

OR:

is the BIN process more like" OK it gets 114 lumens at 7.35V and max current (whats that current ) then it's a V BIN

and the next LS will hit 147 but at only 6.9V so it a V aswell but it is effectivly substantially brighter.Is that how it works?

A given V3U binned LV outputs between ~114 and ~148 lumens when driven at 700mA when the temperature at the join between the emitter slug and the heatsink is 25C

so at 1.2-1.4 it should be well over 150 till it heats up. correct?

some will hit the 147 and some will hit the 114 but both are V's hmmmm...., I guess this is what the luxeon lottery is all about.

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hotbeam said:
A given V3U binned LV outputs between ~114 and ~148 lumens when driven at 700mA when the temperature at the join between the emitter slug and the heatsink is 25C

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Actually the test condition is at 25C at the die itself. This will be is 8 C/W higher than at the slug/heatsink junction for steady state operation. It is true that if the test is done with very low duty cycle pulses the die and slug/heatsink junction will be about the same temp. As tested at the factory, there is no heatsink. Low duty cycle pulses are used so there is negligible heating.

Re: V3U &1.2 A should be brighter than 150 lumens

What would the output of a X3T at 750 milliamps? Assuming 25C temp is maintained.

Thanks,
CY

Re: V3U &1.2 A should be brighter than 150 lumens

Go see the "Realistic luxeon simulation" thread in the LED forum /ubbthreads/images/graemlins/wink.gif

Re: V3U &1.2 A should be brighter than 150 lumens

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cy said:
What would the output of a X3T at 750 milliamps? Assuming 25C temp is maintained.

Thanks,
CY

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As I understand it, each Luxeon bin is 30 percent brighter than the one beneath it. So W would be 30% brighter than V, and X would be 30% brighter than W. Since 1.30 * 1.30 = 1.69, X would, on the average, be 69% brighter than V at 700 mA.

Paul

Re: V3U &1.2 A should be brighter than 150 lumens

You mean X would be 69% brighter?

Re: V3U &1.2 A should be brighter than 150 lumens

Thanks Evan. You're right.

My mistake. I've corrected it.

Paul