New Luxeon LED specs at Lumiled

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Pinter

Newly Enlightened
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Oct 28, 2003
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There is a new technical presentation on Lumiled's website
Here

There is some interesting data on the new Luxeon LED:
- max junction temp. is 185C
- Thermal resistance is 9 C/W
- Maximum current 1500mA

I think the well-known drivers should be redesigned for the higher current.
 
L

LITEmania

Guest
>70lumen at 700mA is not suprising

but Tj 185C and 9C per W is amazing.

Also, there has been amazing progress in thermal efficiency in mcpcb manufacturers.

Warren,
 
nexro

nexro

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Very interesting... awaiting the Enhanced Luxeon /ubbthreads/images/graemlins/smile.gif

eTendue,
also saw your nickname in there /ubbthreads/images/graemlins/tongue.gif
 
NewBie

NewBie

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"Next generation device technology delivers Next generation device technology delivers
15 15 -- 30% improvement in lumen 30% improvement in lumen performance"

Notice the body is now 7.32mm square (not counting the four leads)

The LED die looks bigger, so it has more area for heat transfer. Also notice how it is recessed in a pentagon cavity.

luxeon4.jpg
 
L

Lucien

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I wonder if the die area is also enlarged. If it is it might be more difficult to focus than the existing Lux I and IIIs.

And if that tech drawing is accurate, it's not too early to start designing new heatsinks for the modders. /ubbthreads/images/graemlins/wink.gif

The concept of a projector lamp they mention on page 21 is also interesting, though probably not gonna happen for a while...
 
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evan9162

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That's not a white Luxeon in that photo. The white ones will still appear yellow because the die will be covered in phosphor.
 
E

evan9162

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Given:

185C Max Tj
Rt j-a = 9C/W

Then maximum power dissipation (ideal scenario) to reach max Tj is about 17W

If these new Luxeons generally follow the same I/V curve, then 2.4A would give a Vf of around 4.3V, for Pd of 10.3W.

So with good heat sinking, you will probably fuse the bond wires open before exceeding the max temp of the junction.
 
B

Billson

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Just curious, is the phosphor applied to the die or to the glass dome of the led? This is what determines the color of the light being emitted, correct?

Is the dome the same size as the current ones? If so then it should fit in the current reflectors available.
 
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evan9162

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The phosphor is applied to the die.

Red, orange, amber, blue, green LEDs emit that light directly from the die, so no phosphor is used. White is the combination of a blue LED and a yellow phosphor, combining blue and yellow/green light to make white. Some of the blue is converted to yellow/green light, and some shines through. Minor variances in the application (thickness, etc) will cause variations in tint in the white Luxeons.
 
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