Cree XLamp XHP70.2 LED true power?

Hello everyone just wanted to say if this is in the wrong section I am sorry I have been out of the forum game for a few years.
Recently I scored a bunch of Luminus CBT-140 led’s NOS for less than $10 each. They are binned for 5.8K lumens :o.
I came to wonder what the most powerful single die LED was and came across posts about the Cree XLamp XHP70.2 claiming as high as 8K lemens.
Here is my problem I can not find in the datasheet any mention of them rated for anything higher than 3.8K lumens.
I found sources citing the max drive current at 4.8 amps at 4K lumens giving them and efficiency of 150 Lumens per watt.
Where other sites say they drive them at 10 amps ??
If those specs are true that is awesome as the CBT-140’s have a staggeringly high driver current of 28 amps with an abysmal output efficiency of 40 lumens per watt?

LED manufacturers do not test LEDs to destruction and put the lumen output recorded just before the magic smoke came out into the datasheet, but flashlight nerds do such things and put the result into BLF posts. That’s the reason for the discrepancy.

Cree is mostly selling the XHP70.2 to people who are building mains-powered lighting equipment that’s expected to run for years at good efficiency and publishes numbers centered around consistent, reliable, and repeatable performance. Cree emitters are usually rated for 50,000 hours in the conditions described in the datasheet. The datasheet for the CBT-140 shows different lifespans for different drive currents, as low as 10,000 hours for 28A (still assuming proper cooling).

The XHP70.2 is a quad die led, not single die. It is made for lighting up things so efficiency is important. And it can be enormously overdriven if cooled well yes. :slight_smile:

The big single-die Luminus leds are usually made for projection purposes where efficiency is less important than illuminance.

As was said, the 70.2 is a quad die led, so technically not a single die emitter. It is capable of crazy output though if direct driven. That 8k lumen figure isn’t a joke. You need about 8 amps on 12 volts and 16+ on 6v for that and lots of cooling. Cree’s 4000lm figure is at around 4.8 to 5A on 6v. The highest output single die emitter? Probably Luminus SBT 90.2.

Cool thanks for the help guys I ran across a testing thread for these led’s today on this forum :smiley:
I did not realize the XHP70.2 LED was 4 emitters. I saw the t pattern and just assumed they were traces. Though that makes sense as they have a 12V version. I will have to pick up a few of these LED’s as they seem to be really cheap.

If you can find real xhp70.2s on mcpcbs for under $12 I’d like to know. They aren’t exactly cheap these days. An SST40 cost around $6 on a good mcpcb by comparison.

Convoy store has them for about $12 and I’ve read Simon is willing to offer discounts to blf members. They’re 6V only though

XHP70 voltage selection is determined by the contacts on the MCPCB. The emitters themselves can be run in 2S2P (6V) or 4S (12V).

Convoy sells them on a 6V star only.

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Can you give me that link ?
I searched and cannot find them, THANKS :wink:
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https://www.aliexpress.com/item/32850483915.html

I’ve read on a blf post from a few years back that he gave a 15% discount if you messaged him directly on Ali express for it then sent him the money on PayPal. I’m not sure if that’s the case anymore but from what I’ve seen, 12.52 is a very fair price for XHP70.2s already on a board

That is an entirely reasonable price for one that you know is on a dtp board and is real- not a knockoff.

THANKS ” Sunnysunsun ” :+1:
I need 3 for another big build. :wink:

Hi, thanks for the link for genuine xhp70.2 chip, Does anyone know reputable seller for 12v version? I cannot use 6v because high amps. -Thanks

Mountain electronics, but shipping will be expensive since they are in the US.