Cree announced XHP35.2 and XPG2-HE

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JasonWW
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Agro wrote:
2 bond wires in, 2 bond wires out like:
N N
P P
N N
P P
?

I think I understand what your saying.

The top of the die has both N
The bottom of the die has both P
Then they can stay tightly together and be 6v.

So they had 3 choices.
Make it 6v and tightly spaced
Make it 12v and tightly spaced
Make it able to do both, but have gaps.

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thijsco19
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Yes and they choose the most logical option. Only having a single option meaning single design and manufacturing process.

Especially for industrial use (or non-flashlight use) you’ll only need a 12v version.

thijsco19
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They have updated the XP-G2 page and datasheet with the new HE version.
http://www.cree.com/led-components/products/xlamp-leds-discrete/xlamp-xp-g2
datasheet: http://www.cree.com/led-components/media/documents/XLampXPG2.pdf

Still nothing on the XHP35.2

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Maybe it’s just me, but it looks incredibly hard to dedome.

If you don’t like what it looks like on the wall, take it outside.

Agro
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There is XHP35.2 datasheet available:
https://www.cree.com/led-components/media/documents/datasheet-XHP35-2.pdf
New info:

  • 12V only
  • binning goes to E2 (though they list E4 in the list of bins, they don’t mark it as available for any CCT)
  • dome is a bit smaller (height of 2.65 instead of 2.8 mm)
  • wider FWHM (135° instead of 125°)

Seems to me like a purely inferior product for our uses. Sad

The Lamer
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Kaidomain got some XP-G2 HE in stock.
Who will try?

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I was looking for trower then stumble this. Its XHP 35.2 HI. I dont think or maybe if i miss, there isnt yet a light that use this version. Old version is xhp35 hi without .2.My thought is that, if there any available, can someone name it. My 2nd thought is probably it will be in discussion to made or pre production.

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Do you mean that you have seen XHP35.2 HI or do you enquire whether it exists?
I don’t think it exists but I might just not know.

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Any flashlight using XHP 35.2 HI ? Flashlight always, for trower,using high intensity led like xhp35 hi and ussually had beam above 50kcd – 100kcd even MOAR. I do know this when xhp70 led been upgrade to xhp70.2. Do check there a topic about this in blf threads.

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The 35.2 does not seem to offer much improvement over the current version. Therefore I dont think there is much interest in it.

I haven’t heard of it being available, so maybe when it does come out we will find some type of improvement. Maybe it will handle higher amperage for increased output? Who knows.

A new 3v version of the 50.2 recently came out. Maybe the 35.2 will be available in voltages other than 12v?

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XHP70.2 is throwier than XHP70 because the dies are closer together.
That’s not the case with XHP35.2. It’s a floodier but more efficient variant.
XHP35.2 HI? I don’t think it exists and I don’t think it ever will. Just like there’s not XP-L2 HI.

XHP35.2 might be interesting for some small flooders – but for throwers? I don’t think so.

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Agro wrote:
XHP70.2 is throwier than XHP70 because the dies are closer together.

I don’t think this is true. The big difference you see is that the xhp70 has a darker hot spot center, while the 70.2 has a smoother spread of light. Check these pics at the same distance, same light, but different leds. This is with the exposure turned down to highlight the hot spot smoothness.

The actual throw distance doesn’t change much, but of course the 70.2 is capable of outputting more lumens which can increase the throw a little.

The closeness of the dies doesn’t seem to have any effect on the throw distance.

Since it looks like the 35.2 has the dies a little further apart, we might see a little more of a dark spot in the center of the beam. We will have to wait and see if this is the case or not.

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According to CREE PCT, the XHP35.2 has lower lumens output than XHP35 of the same bin until you reach 1A current, for some reason. Then, it starts to take a slight lead in output. But the XHP35.2 has a lower Vf than the older XHP35 version, so it will be more efficient. On the low end, the XHP35.2 even has worse lm/w efficiency than the XHP35 up to 250mA, where they have equal efficiency. Above that, the XHP35.2 has better efficiency. So, it’s a mixed bag. The only measurement that stays consistently better is the lower Vf at each level of current usage from the bottom of the chart to the top.

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DavidEF wrote:
According to CREE PCT, the XHP35.2 has lower lumens output than XHP35 of the same bin until you reach 1A current, for some reason. Then, it starts to take a slight lead in output. But the XHP35.2 has a lower Vf than the older XHP35 version, so it will be more efficient. On the low end, the XHP35.2 even has worse lm/w efficiency than the XHP35 up to 250mA, where they have equal efficiency. Above that, the XHP35.2 has better efficiency. So, it’s a mixed bag. The only measurement that stays consistently better is the lower Vf at each level of current usage from the bottom of the chart to the top.

It seems almost criminal running an XHP 35.2 at 250mA!

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LouieAtienza wrote:

It seems almost criminal running an XHP 35.2 at 250mA!


Flashlights are designed to run at a variety of brightness levels to suit one’s needs. Someone might need to read a map with a BLF GT. Big Smile

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Has anyone found the 35.2 HI for sale yet?

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Agro wrote:
https://www.led-professional.com/ssl/featured-product-story/cree-r-xlamp...

Looks like they covered the side phosphor with a white opaque material to reduce the side phosphor excitation.

Some context I posted in another thread:

EasyB wrote:
I’m pleasantly surprised to see the XHP35.2 HI announced. In my experience with slicing XHP50.2s the tint shift common with this type of LED is made even worse by slicing. The main function of the dome is so more light can exit the die. When the dome is sliced off it seems like more light bounces around in the phosphor layer and reaches the phosphor to the side of the dies. This results in the side-phosphor being excited more, and this is the main source of the tint shift with these LEDs. If the side-phosphor is removed (sliced and diced) it reduces the tint shift. So I will be interested in seeing what, if anything, they do to reduce that side-phosphor tint shift.

As a side note you see some of this side bouncing effect in the XPL HI as well. Since it is domeless more light bounces and reaches the side areas, but there is no phosphor to the sides, it is just white silicone material so it is the same color as the main light exiting the die. The effect on the beam is that it adds a soft halo around the hotspot. If you compare a XML2 light with and XPL HI light the XML2 hotspot is more defined/has a sharper brightness cutoff.

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JasonWW wrote:
The_Driver wrote:
SKV89 wrote:
Doesn’t seem like much progress in the XHP35.2 especially with the larger separation, which means possibly no XHP35.2 HI variant. I alwasy wonder what’s the purpose of the XHP35 HD when there are already XHP50.2 and XHP70.2 that are brighter and more efficient.

It’s physically smaller.


Yeah, it’s the biggest die with the most output using a 3.5mm pad. So if you have a street light full of xpl, it can be easily swapped to xhp35 and you get way more light from the same surface area. That’s how I understand it.

BTW, none of these leds are made for flashlights, they are more for street lights and commercial stuff.


I know NOTHING about street lighting but if the size of the pad matters for swapping LEDs out that would imply the LEDs would be reflowed for light, is that what happens?
I’d be impressed if so.
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I’m curious if the emitter in the picture is a prototype/pre production version. The quality/precision of that phosphor and silicone pour really are embarrassing IMO. This is CREE we are taking about here. Really seems they’re losing their pedigree..

I find this wattage/size emitter about ideal for our lights, so if things change and their high CRI options become competitive with respect to beam quality, I’d have a use for these. But my hopes aren’t high, sadly.

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