Cree XT-E White announced

[mds82]

Cree's XT-E White announced

http://cree.com/products/xlamp_xte_awt.asp

[AnAppleSnail]

Whoa - Fwd voltage all the way down to 2.50v!

[hank]

Dang, I need to replace all my flashlights again.

[AnAppleSnail]

Dang, I need to replace all my flashlights again.

Fortunately, Cree can't release new lighting standards that make old lights obsolete (Here's looking at .doc/.docX!). But I keep wanting to take their new phosphor-dome LEDs and make a showerhead dropin taking 1 amp per LED. I think 3xIMR18650 would give me 20A of direct drive fury...

[orbital]

+

They have a very floody Typical Spatial Distribution, more than say XP-G.


Looks geared for room lighting systems.

[calipsoii]

Looks like they're only guaranteeing 80CRI with this new batch. I guess 90CRI isn't worth the effort?

[mvyrmnd]

Fortunately, Cree can't release new lighting standards that make old lights obsolete (Here's looking at .doc/.docX!). But I keep wanting to take their new phosphor-dome LEDs and make a showerhead dropin taking 1 amp per LED. I think 3xIMR18650 would give me 20A of direct drive fury...

Hey! That was my idea!

[AnAppleSnail]

Hey! That was my idea!

It's not like I have 3x IMR18650 to use ... so I think you'll beat me to it. But I do have about twelve LifePO4 18500s. 600 mAh capacity though

[MikeAusC]

Whoa - Fwd voltage all the way down to 2.50v!

2.50 volts . . . at ONE milliamp.

At 700mA it drops 3.05 volt.

At 700mA the XM-L drops 2.90 volt.

[MikeAusC]

Dang, I need to replace all my flashlights again.

Why ???

At 700mA an XT-E Neutral puts out 203 Lumens.

At 700mA an XP-G Neutral puts out 213 Lumens.

At 700mA an XM-L Neutral puts out 240 Lumens.

[mvyrmnd]

True, but if you take physical size and cost into account, you can get more lumens per square centimeter, for less money using XT-E's.

It's not like I have 3x IMR18650 to use ... so I think you'll beat me to it. But I do have about twelve LifePO4 18500s. 600 mAh capacity though

I don't have the skill to build anything like that, so I'm guessing you'll win

[hank]

> Why??

a) just kidding,
b) "very floody" works for me, and
c) I'm watching fixed lighting cost/efficiency, eventually planning on adding cove lighting everywhere.

[Microa]

Why ???

At 700mA an XT-E Neutral puts out 203 Lumens.

At 700mA an XP-G Neutral puts out 213 Lumens.

At 700mA an XM-L Neutral puts out 240 Lumens.

XT-E is rated at Tj=85C while XP-G and XM-L are rated at Tj=25C, the output of XT-E at least as good as the XP-G.

[JohnR66]

Would have to do a comparison of the spacial distribution curves. The design looks like it might put more light into a reflector. May be an interesting flashlight LED.

[tstartrekdude]

It sure looks to have a 1mm by 1mm die, and given the very high binning temperature...This may be the first good news for thrower fans in a very long time.

[fyrstormer]

Fortunately, Cree can't release new lighting standards that make old lights obsolete (Here's looking at .doc/.docX!). But I keep wanting to take their new phosphor-dome LEDs and make a showerhead dropin taking 1 amp per LED. I think 3xIMR18650 would give me 20A of direct drive fury...

For some reason, when you mentioned the word "showerhead", I envisioned a desk lamp made from an actual showerhead, with the nozzles replaced with LEDs, constructed specifically for the purpose of confusing the hell out of everyone.

[saabluster]

It sure looks to have a 1mm by 1mm die, and given the very high binning temperature...This may be the first good news for thrower fans in a very long time.

Yes it is 1mmx1mm. Good news for thrower fans? Meh.

[frosty]

XT-E is rated at Tj=85C while XP-G and XM-L are rated at Tj=25C, the output of XT-E at least as good as the XP-G.

This is a significant change to the way they are binned.

[AnAppleSnail]

This is a significant change to the way they are binned.

They've tried to make things more realistic - like FourSevens stepping up to the ANSI rating and having their S2 XP-G quarks rated at lower output than the R5-bin lights.

Would have to do a comparison of the spacial distribution curves. The design looks like it might put more light into a reflector. May be an interesting flashlight LED.

XT-E left, XP-G right. I can't make heads or tails of it. Maybe the XP-G curve is plumper in the middle and lower at the edges though.

[Z-Max]

XT-E is rated at Tj=85C while XP-G and XM-L are rated at Tj=25C, the output of XT-E at least as good as the XP-G.

But XTE has termal resistance 5 C/W, XML 2.5.

[AnAppleSnail]

But XTE has termal resistance 5 C/W, XML 2.5.

XT-E 5 C/W 3.45mm square, 100% rated output at 85C
XP-G 4 C/W 3.45mm square, 88% rated output at 85C
XM-L 2.5 C/W 5mm square, 90% rated output at 85C

Compare the area and rated output at 85C.

[SemiMan]

They've tried to make things more realistic - like FourSevens stepping up to the ANSI rating and having their S2 XP-G quarks rated at lower output than the R5-bin lights.




XT-E left, XP-G right. I can't make heads or tails of it. Maybe the XP-G curve is plumper in the middle and lower at the edges though.

Spatial distribution is likely a far-field measurement and hence the source size does not play into it. It gives an indication, but only that, of how it will do in a reflector. However, given that it has that shape and the source size is small, one could guess that perhaps it behaves like a small source and would be better than the XP-G

[bshanahan14rulz]

I think the thing to do is figure out if the whole dome, or even the entire "clear" covering, corners and all, lights up, and then figure out an LED that has that same apparent size.

I like when Cree releases new LEDs. I just wish it would affect the prices of the "old" ones more ;-)

[saabluster]

I think the thing to do is figure out if the whole dome, or even the entire "clear" covering, corners and all, lights up, and then figure out an LED that has that same apparent size.

I like when Cree releases new LEDs. I just wish it would affect the prices of the "old" ones more ;-)

At least in the "old" XP-E HEW, which is identical to the XT-E from chip up, the dome was perfectly clear. The dome did not contain any phosphor despite some people's comments around here. I ripped the dome off to see for myself.

[blasterman]

Looks geared for room lighting systems.

Cree makes power LEDs that aren't geared towards 'room lighting'?

[AnAppleSnail]

Cree makes power LEDs that aren't geared towards 'room lighting'?

They make some that work well enough for flashlights.

[RoGuE_StreaK]

Any ideas on pricing / availability of these? Seems vaguely comparable to an XP-G but with less output as the current increases, so unless it's significantly cheaper, the XP-G's still better for mine. I think I'd want it to be at least 2/3 the cost. Yeah the voltage/current is slightly less, theoretically you could feed it 1.5A for the entire useable portion of a single lipo, but the XP-G is only slightly affected at the tail end of lipo life, depending on where you set your cutoff voltage.

PS. Where'd that spatial distribution image come from? Seems a lot different to the one on page 9 of the spec sheet? eg. I read 60% output @ 50degrees according to the spec sheet?

[darkmilk]

Looks like just under AU $2 each, but the site doesn't specify which bin/tint that is.

[RoGuE_StreaK]

Interesting, Cutter has them (as darkmilk said, no bin specified) for about Aus$2 each, as opposed to the XP-G's at $5.50+ each! Have requested a sample, I was going to be tossing up between XP-G's and XM-L's (for "ludicrously bright" option, well, relatively), but these seem reasonably comparable to the XP-G for almost 1/3 of the price, just depends on whether there's enough lumens for my needs; I know, you can never have enough lumens, but considering a Luxeon K2 seemed to almost reach my initial goals, these suckers may well do the trick.

That said, the cost of the LEDs is nothing compared to the rest of the system...

Any thoughts on how these are likely to compare heat-wise? I'm not very good at interpreting the figures to deduce what kind of heat it'll generate.

[pretmetled]

Cree makes power LEDs that aren't geared towards 'room lighting'?

Stupid question: Who does make mid-power LEDs that are geared towards room lighting? Since low/mid/high is rather subjective, say 100 - 200 mW per emitter.