MC-G on the cards?
- Thread starter marcopolo
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frosty
Enlightened
I certainly hope so. Although it might be a while, since the XP-G has only just been released.
tstartrekdude
Newly Enlightened
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- May 17, 2008
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No, i don't think 4 XP-G's die's would fit in one package, they are twice as big as the XR-E die's. it would have to be P7 sized, not that i would be opposed to that 
lolzertank
Enlightened
There could be one... but don't hold your breath. :green:
They will easily fit. The XP-G die is 1.4mm * 1.4mm, so two would be 2.8mm * 2.8mm. The MC package is 7mm * 9mm, and even without leads it is around 6mm * 7mm.
No, i don't think 4 XP-G's die's would fit in one package, they are twice as big as the XR-E die's. it would have to be P7 sized, not that i would be opposed to that
They will easily fit. The XP-G die is 1.4mm * 1.4mm, so two would be 2.8mm * 2.8mm. The MC package is 7mm * 9mm, and even without leads it is around 6mm * 7mm.
I'm ressurecting this thread to ask the question from another viewpoint:
What was the time difference in months between the XR-E being released and the MC-E being released?
I'm conviced Cree will make a 'surprise' announcement about a quad die XP-G around march 2010.
Marco.
What was the time difference in months between the XR-E being released and the MC-E being released?
I'm conviced Cree will make a 'surprise' announcement about a quad die XP-G around march 2010.
Marco.
baterija
Flashlight Enthusiast
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- Feb 7, 2008
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- 1,053
2+ years if I recall correctly
jtr1962
Flashaholic
I'm going to go out on a limb and say there will be no MC-G. There are a host of reasons for this, but the basic one is that efficiency is increasing and droop is decreasing. Because of these factors, a single die LED should be able to match the ~800 lumens which an MC-E can currently put out at about 25% of the cost. Cost per lumen is what it's all about here. 4-die LEDs will always do worse than single-die LEDs in that department.
Right now consider that the best-binned XP-Gs are rated at up to 367 lumens at maximum current. The coming S2 bin will increase that to 400 lumens. Not hard to imagine ~500 lumens at 1 amp a year from now, perhaps even 550 with anti-droop technology. And these efficiency increases may well allow Cree to rerate these higher-binned XP-Gs at 1.5 amps without changing the package. So now you might be at 700+ lumens for a single-die LED costing $3 in quantity. A 4-die version of the XP-G wouldn't offer 4 times the output due to thermal limitations. Perhaps you might get 3 times whatever a single die XP-G offers, but at 4-5 times the cost.
There is one reason and one reason only that 4-die LEDs were made-namely because you needed lighting class outputs of 600 to 800 lumens in a single package, and single die LEDs of the time just couldn't do that. So they were made despite the higher cost per lumen. Now we're almost there with the XP-G. We will be there in a year I'd say. By the time Cree designed and tested a hypothetical MC-G it would already be pointless. It would cost more per lumen than a single-die XP-G. And you just wouldn't need the kind of outputs in a single package which an MC-G would offer. 600-800 lumens per package is all most of the lighting industry needs. Any more than that and you want multiple packages anyway to spread the light and heat. As I've said a bunch of times, multi-die packages are something the LED industry would like to get away from ASAP. The trend is towards larger single dies. For those relatively few applications requiring single emitters with huge outputs (i.e. streetlights), you already have the SST-50 and SST-90. I'm honestly not seeing much point to multi-die emitters any more. About the only advantage they occasionally offer is ability to more closely match the LED and power supply voltages. But with switching regulators being able to step down to low voltages and higher currents ever more efficiently, that advantage is increasingly becoming moot.
Right now consider that the best-binned XP-Gs are rated at up to 367 lumens at maximum current. The coming S2 bin will increase that to 400 lumens. Not hard to imagine ~500 lumens at 1 amp a year from now, perhaps even 550 with anti-droop technology. And these efficiency increases may well allow Cree to rerate these higher-binned XP-Gs at 1.5 amps without changing the package. So now you might be at 700+ lumens for a single-die LED costing $3 in quantity. A 4-die version of the XP-G wouldn't offer 4 times the output due to thermal limitations. Perhaps you might get 3 times whatever a single die XP-G offers, but at 4-5 times the cost.
There is one reason and one reason only that 4-die LEDs were made-namely because you needed lighting class outputs of 600 to 800 lumens in a single package, and single die LEDs of the time just couldn't do that. So they were made despite the higher cost per lumen. Now we're almost there with the XP-G. We will be there in a year I'd say. By the time Cree designed and tested a hypothetical MC-G it would already be pointless. It would cost more per lumen than a single-die XP-G. And you just wouldn't need the kind of outputs in a single package which an MC-G would offer. 600-800 lumens per package is all most of the lighting industry needs. Any more than that and you want multiple packages anyway to spread the light and heat. As I've said a bunch of times, multi-die packages are something the LED industry would like to get away from ASAP. The trend is towards larger single dies. For those relatively few applications requiring single emitters with huge outputs (i.e. streetlights), you already have the SST-50 and SST-90. I'm honestly not seeing much point to multi-die emitters any more. About the only advantage they occasionally offer is ability to more closely match the LED and power supply voltages. But with switching regulators being able to step down to low voltages and higher currents ever more efficiently, that advantage is increasingly becoming moot.
Man. Talk about bad timing. I just got a message that top bin MC-Es are now $14.22 at Cutter. With free shipping! Crazy I tell you. I wonder if they are not clearing room for a new MC-G? Probably not. I'm sure they need to move product and that line has been hit hard with the release of the XP-G.
R@ndom
Enlightened
4sevens mentioned something about MC-G sometime back...
StarHalo
Flashaholic
BRING ON THE 1000 LUMEN SOLITAIRES!
(That burn your hand in ten seconds..)
(That burn your hand in ten seconds..)
