Where are we? What companies now make LEDs, and what models?
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csshih
Flashlight Enthusiast
we are now at Cree XR-E, MC-E(quad die)
Luxeon K2 TFFC
Seoul P4, P7(uses cree chips.. older than MC-E, quad die)
and borderline SST-50/SST-90.
Luxeon K2 TFFC
Seoul P4, P7(uses cree chips.. older than MC-E, quad die)
and borderline SST-50/SST-90.
rmteo
Flashlight Enthusiast
lolzertank
Enlightened
IIRC, most current flashlights use one of these:
Cree: (Xlamp) XR-E, MC-E, XP-E, (soon to be released) XP-G.
Seoul Semiconductor: (Z-Power) P4, P4 High CRI, P7
Lumileds: (Luxeon) Rebel TFFC, K2 TFFC
Luminus: (Phlatlight) SST-50, SST-90
Nichia: 083 High CRI, GS, DS
Osram: Golden Dragon Plus
Cree: (Xlamp) XR-E, MC-E, XP-E, (soon to be released) XP-G.
Seoul Semiconductor: (Z-Power) P4, P4 High CRI, P7
Lumileds: (Luxeon) Rebel TFFC, K2 TFFC
Luminus: (Phlatlight) SST-50, SST-90
Nichia: 083 High CRI, GS, DS
Osram: Golden Dragon Plus
Cool!
Does anyone have this with the general efficiencies so one could get a comparison of all of them?
blasterman
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You forgot Bridgelux.
lolzertank
Enlightened
I haven't really heard of these before other than a cursory glance at the Bridgelux thread. 
Most of them are about 90-100 lm/W at low currents (350ma for XR-E, XP-E, P4, Rebel TFFC, K2 TFFC, Golden Dragon Plus, 350ma per die for the MC-E and P7, 1.7A for the SST-50 and 3.2A for the SST-90, 20ma for the DS and GS). This drops to about 60 lm/W at about 3x the current (don't do this with the DS and GS).
Now to the exceptions...
The XP-G is considerably more efficient than previous LEDs, producing about 130 lumens per watt at 350ma. Even at 1A, it can produce 100 lumens per watt while its predecessors have fallen to 60.
The high CRI SSC P4 and Nichia 083 are only about 50-60 lm/W at 350ma. They have much better color rendering than other LEDs though and produce light almost like an incandescent.
All of these efficiency measures are with top bins in mind, so obviously they will be lower if you don't get the cream-of-the-crop for that type of LED.
uplite
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Some of us will, of course, but it's a small step, not a big leap.
XP-E already does 130 lumens @ 350mA (R3 bin). If you need lots more light, you can run a quad-die at the same current. The XP-G only breaks away from the pack at high drive currents. At least according to the Cree PR. I haven't seen a public datasheet yet.
Personally, I think the quad-die RGBW is more interesting. Just imagine...dynamic color/tint control and color calibration...sweet... :twothumbs:
-Jeff
What is a high drive current? not 350mA?Some of us will, of course, but it's a small step, not a big leap.
XP-E already does 130 lumens @ 350mA (R3 bin). If you need lots more light, you can run a quad-die at the same current. The XP-G only breaks away from the pack at high drive currents. At least according to the Cree PR. I haven't seen a public datasheet yet.
Personally, I think the quad-die RGBW is more interesting. Just imagine...dynamic color/tint control and color calibration...sweet... :twothumbs:
-Jeff
So what lights are using a high drive current, and which ones are not?
What do most CR123 lights run at?
uplite
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It depends on the package...as you might guess from the widely varying "low" currents that lolzertank listed above. :thumbsup: You can download the datasheets for specific LEDs from their manufacturers if you want the "high" numbers. FWIW, the Crees have published max current of 700mA (XPE, MCE dies) or 1A (XRE). XP-G announcements mentioned at least 1A.
It depends on which emitter they use, levels of output, thermal management, whether they overdrive, etc. Check the specs for the light in question. Some manufacturers will tell you outright the drive currents for each mode. If not, they'll give you at least the lumens, and you can work backwards to figure out the current from the emitter datasheets.
-Jeff
If bridgelux could come out with a "dome" version I'd be all over it (and if you could get lens/reflectors)
but for flashlights and directional lighting, I donT' see how they can be used. For interior applications though they seem great.
Unless I'm completely missing something?
jasonsmaglites
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what is the XP-E and the XP-G?
sst-90?
i have missed a generation of led's and didn't even know it. what's the deal? this looks like a whole jump up from our typical r2/r3 bin jumps.
sst-90?
i have missed a generation of led's and didn't even know it. what's the deal? this looks like a whole jump up from our typical r2/r3 bin jumps.
spencer
Enlightened
The XP-E is just a smaller version of the XR-E. It uses the exact same die (1mm^2). The XP-G uses the same package as the XP-E but it uses a larger die (2mm^2). The SST-50 uses an even larger die (5mm^2 IIRC)
jasonsmaglites
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my head is spinning.
i only knew of cree xre, ssc p4, rebel 80 and 100, k2 (stupid) and thats about my led knowledge world right there. we should chart these with the specs and information about them for ones that got left behind :sigh:
i only knew of cree xre, ssc p4, rebel 80 and 100, k2 (stupid) and thats about my led knowledge world right there. we should chart these with the specs and information about them for ones that got left behind :sigh:
blasterman
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http://www.ledil.com/index.php?page=bxra-c0400
In all fairness, if we go back to LED technology only being discussed in the context of flashlights (not sure what the OP was referring to) I'll go back to whale oil lamps.
itch808
Newly Enlightened
XP-G is going to be where it's at, guaranteed. Small step? More like giant leap! Especially compared to the Q5->R2 hop
uplite
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+1 :laughing:In all fairness, if we go back to LED technology only being discussed in the context of flashlights (not sure what the OP was referring to) I'll go back to whale oil lamps.
For flashlights, to each their own, but I don't have much use for more than 100 lumens. The standard 350mA drive current is more than enough.
According to the numbers that CREE presented in May, when you move from the XP-E R2 to the XP-G R4 you get:
14% brighter @ 350mA
~4% lower Vf @ 350mA
so, 19% more lumens/watt @ 350mA
Not a very large step. The real jump comes when you run higher currents, e.g. for installation lighting. Then you get:
22% brighter @ 700mA
~5% lower Vf @ 700mA
so, 28% more lumens/watt @ 700mA
And if you want to squeeze the most lumens out of a single die...not caring about efficiency...the XP-G is rated to at least 1000mA (XP-E is rated to 700mA).
It seems like CREE is moving in the right direction for home & commercial lighting, while also keeping the insanely-bright-flashlight crowd happy.
-Jeff
TorchBoy
Flashlight Enthusiast
Hm, an LED List with links to suppliers. Is there anything like that at present?
