New CREE XR-C

[LED Chick]

Cree has just announced the new XR-C. It is in Cool white only and has the same body as the XR-E but uses a smaller chip.
Smaller chips = less $ and higher efficiency

Output is wider than the XR-E and TR is higher: 12C/W

Top operating current is 500mA but I think you'll se it mostly used from 150mA -350mA..

Most people will probably see it as a 1/2W altermative

It has a lower price point than the XR's to date..

 

[jsr]

Too bad it's cool white. I prefer warm tints...even greenish is ok with me.

 

[Raptor#]

Sounds like a good alternative to 5mm leds for coincell lights, no?

 

[chevrofreak]

Smaller chips = less $ and higher efficiency

Less $ anyway. The efficiency isn't as high as the XR-E.

 

[chevrofreak]

Too bad it's cool white. I prefer warm tints...even greenish is ok with me.

Cool white is closer to sunlight. Warm white is closer to the yellow of an incandescent bulb, and isn't as efficient.

 

[2xTrinity]

Cool white is closer to sunlight. Warm white is closer to the yellow of an incandescent bulb, and isn't as efficient.

Just about every LED flashlight I have except for my "warmest" Cree LEDs are significantly more blue than sunlight. That Cree LED I speak of looks pretty ugly (green tint) on a white wall, but so far renders color better than any other LED I have -- most of the others are too low in green. My warmest cree LEDs are pretty close. In terms of lumens per watt -- the extremely bluish cool white color I suspect is less efficient than a 4000k color temperature that would have a higher output in green (the most sensitive color). Incandescent is an extreme in the other direction with tons of output in red and yellow.

I prefer 3500k (still slightly warm) and 4100k best for indoor lighting -- I like both incan and daylight style lamps less.

 

[enLIGHTenment]

Be cautious when attempting to judge the color temperature (blue-yellow spectrum) of a light source by eye. Perceived color temperature varies greatly with intensity according to the Bezold-Brücke hue shift effect. As intensity increases, the perceived color temperature will decrease (shift to yellow from blue) even though the actual color temperature will remain the same.

http://www.lifesci.ucsb.edu/~mrowe/Bezold-Brucke.html
http://palimpsest.stanford.edu/waac/wn/wn21/wn21-3/wn21-308.html
http://www.schorsch.com/kbase/glossary/cct.html

Sunlight has a color temperature of around 5500K. This is equivalent to a V0 Luxeon. U0 is cooler (yellower) than sunlight while Y0, X0, and W0 are hotter (bluer). I don't have the Cree CCT bin codes at hand for comparison.

 

[Monolith]

Output is wider than the XR-E

Output is the same. See new updated XR-E specs.

 

[2xTrinity]

Be cautious when attempting to judge the color temperature (blue-yellow spectrum) of a light source by eye. Perceived color temperature varies greatly with intensity according to the Bezold-Brücke hue shift effect. As intensity increases, the perceived color temperature will decrease (shift to yellow from blue) even though the actual color temperature will remain the same.

http://www.lifesci.ucsb.edu/~mrowe/Bezold-Brucke.html
http://palimpsest.stanford.edu/waac/wn/wn21/wn21-3/wn21-308.html
http://www.schorsch.com/kbase/glossary/cct.html

Sunlight has a color temperature of around 5500K. This is equivalent to a V0 Luxeon. U0 is cooler (yellower) than sunlight while Y0, X0, and W0 are hotter (bluer). I don't have the Cree CCT bin codes at hand for comparison.

When I say the Cree was closest to sunlight, I mean, I held some of the flashlights I had in the garage two inches above the ground in a shadowy part of the floor, and compared the hotspots from the lights to the sunlight (this was around noon) coming in the open door, so intensity was the same. between the sunlight and the flashlight hotspot -- the Cree was the closest.

Cree Bin Specs. I believe the one I had was a WH bin (I'd have to desolder the star to double check), which would put it in the 5600-5000K range with a greenish tint. Most of my others are WD which is more like 6000K without any particular "tint".

 

[cage]

I ordered a sample XR-C part. How likely am I gonna get one? Have any of you guys received samples from cree?

 

[LED Chick]

I think it should!!

 

[LED Chick]

I don't know if CREE is sampling yet. I called my contact at the East Coast Distributor (LED Lighting Supply) and they do not have anything in yet. It sounds like CREE hasn't shipped anything yet since they just made the announcement last week. I would imagine they should have product in the next few weeks.

 

[TMorita]

Cree has just announced the new XR-C. It is in Cool white only and has the same body as the XR-E but uses a smaller chip.
Smaller chips = less $ and higher efficiency
...

Nope, it has lower effiiciency than the XR-E.

http://www.cree.com/press/press_detail.asp?i=1171406802359

It's 74 lumens at 350ma. The XR-E (depending on bin) goes up to 100 lumens at 350ma.

Toshi

 

[LED Chick]

If ran at:

125 mA = 25 lm
350 mA = 60 lm TYPICAL
500 = 78 lm

Looks like a good alternative to people who want a 1 Watt XR-E but don't want to pay the money for it. Probably can get to a P2 bin.

 

[bombelman]

awesome thread !

 

[TORCH_BOY]

Interesting, I still like the XR-E