Spec driven S-bin Lux1 vs underdriven U-bin lux3

Amonra

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An S-bin Lux1 driven to spec would deliver approx 60Lum/Watt according to specs. but what would be the efficiency of a U-bin Lux3 driven at 350mA ?
 

wasBlinded

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It would depend on where in their respective flux bins each LED lies, but when McGizmo compared an SX1J with a UWOK in his possession, the UWOK was slightly brighter at 350 mA drive.
 

chimo

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Keep in mind that the Lumens/Watt rating also depends on the voltage bin of the emitter.

Underdriving the U bin will also drop its Vf (at the operating current) by about a bin.

Paul
 

cratz2

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I'm starting to feel like McGizmo's pimp as often as I'm referencing this chart, but be sure to check this
out.

VERY informative chart.
 

Amonra

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cratz2: thanks for the link. but it seems that McGizmo's S bin Lux1 is not really an S bin as at 350mA it is drawing 1.155 W and giving 51 Lumens i.e. 44 Lumens @ 1W = R bin. i am therefore guessing that a real S bin Lux 1 would outperform a Q bin Lux 3
 

cratz2

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Amonra said:
cratz2: thanks for the link. but it seems that McGizmo's S bin Lux1 is not really an S bin as at 350mA it is drawing 1.155 W and giving 51 Lumens i.e. 44 Lumens @ 1W = R bin. i am therefore guessing that a real S bin Lux 1 would outperform a Q bin Lux 3

I don't think I'm following what you are saying... how is his S-bin not really an S-bin? McGizmo is a highly respected member of CPF and the flaghlight industry just in case you are questioning that.

And I've never seen a Q-bin Lux III... I thought they started at S-bin.
 

IsaacHayes

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Amonra: There is no thing as a Luxoeon 1W. There is Luxeon, LuxeonV, and LuxeonIII.

A Luxeon is actually 1.25watts on average.
 

Amonra

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cratz2: in no way am i questioning mcgizmo's credibility. i just calculated that it was doing approx 44LUM/Watt and made a small mistake thinking that a Lux1 was actually a 1W LED. but as isaachayes pointed out a Lux1 is actually about 1.25W.

I meant U-bin Lux3 not Q-bin.

Im sorry, i guess i was tired when i wrote this
 

cratz2

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So... what exactly are you looking for? The most effecient LED that is a certain brightness? Either way, with realistic expectations (which I know NO CPF members really have) an R-bin or T-bin should make for many happy customers and the S-bins driven at spec or a U-bin driven somewhere over 400ma should also fill many roles.
 

IsaacHayes

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Well, you'll need U-bins underdriven for that. U-bins will have a lower Vf since they are binned at 700ma vs 350ma for Sbin luxeon1's.
example:
Lux1-Vf ~= Lux3-Vf
J ~= K
H ~= J
etc...
And the lower the Vf the more efficient the led is. So the best approach would be Lux3, U--H. And under drive them for even more efficeicncy....
 
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