Cree XLamp XHP70.2 LED true power?

15 posts / 0 new
Last post
lazerman121
lazerman121's picture
Offline
Last seen: 9 months 1 week ago
Joined: 02/05/2018 - 23:10
Posts: 6
Location: Chester Virginia
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?

zak.wilson
Offline
Last seen: 4 days 2 hours ago
Joined: 09/29/2014 - 14:27
Posts: 1015

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).

Ceilingbounce – flashlight testing and runtime graphs for Android

djozz
djozz's picture
Offline
Last seen: 10 hours 30 min ago
Joined: 09/07/2012 - 17:04
Posts: 17962
Location: Amsterdam

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. Smile

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

Sirstinky
Offline
Last seen: 1 hour 2 min ago
Joined: 11/02/2018 - 17:07
Posts: 1334
Location: Vancouver, WA

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.

lazerman121
lazerman121's picture
Offline
Last seen: 9 months 1 week ago
Joined: 02/05/2018 - 23:10
Posts: 6
Location: Chester Virginia

Cool thanks for the help guys I ran across a testing thread for these led’s today on this forum Big Smile
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.

Sirstinky
Offline
Last seen: 1 hour 2 min ago
Joined: 11/02/2018 - 17:07
Posts: 1334
Location: Vancouver, WA

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.

Sunnysunsun
Sunnysunsun's picture
Offline
Last seen: 7 hours 44 min ago
Joined: 08/09/2019 - 12:51
Posts: 743
Location: Toronto

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

zak.wilson
Offline
Last seen: 4 days 2 hours ago
Joined: 09/29/2014 - 14:27
Posts: 1015

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

Ceilingbounce – flashlight testing and runtime graphs for Android

Sunnysunsun
Sunnysunsun's picture
Offline
Last seen: 7 hours 44 min ago
Joined: 08/09/2019 - 12:51
Posts: 743
Location: Toronto

Convoy sells them on a 6V star only.

CNCman
CNCman's picture
Offline
Last seen: 6 hours 17 min ago
Joined: 04/07/2018 - 10:10
Posts: 1192
Location: Mississippi Gulf Coast

Sunnysunsun wrote:
Convoy sells them on a 6V star only.

.
Can you give me that link ?
I searched and cannot find them, THANKS Wink
.
Sunnysunsun
Sunnysunsun's picture
Offline
Last seen: 7 hours 44 min ago
Joined: 08/09/2019 - 12:51
Posts: 743
Location: Toronto

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

Sirstinky
Offline
Last seen: 1 hour 2 min ago
Joined: 11/02/2018 - 17:07
Posts: 1334
Location: Vancouver, WA

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

CNCman
CNCman's picture
Offline
Last seen: 6 hours 17 min ago
Joined: 04/07/2018 - 10:10
Posts: 1192
Location: Mississippi Gulf Coast

THANKS “ Sunnysunsun “ Thumbs Up
I need 3 for another big build. Wink

volcamin
Offline
Last seen: 10 months 1 day ago
Joined: 11/26/2020 - 12:37
Posts: 6
Location: finland

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

freshie in flashlights and in leds, interested to build diy led bar

Sirstinky
Offline
Last seen: 1 hour 2 min ago
Joined: 11/02/2018 - 17:07
Posts: 1334
Location: Vancouver, WA

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