Good feedback. I will avoid the 90 CRI. Tint is more important to me.
I now got a decent 60 Amp power supply, so for testing it I sacrificed one of the 4000 K P2 40E emitter I tested in Dec 2017 and went for a crashtest.
In general, the XHP70.2 is very robust and was destroyed at 33 Amps which is very impressive. Above that the current suddenly drops to 0 and almost no more light came out. At 33 Amps it reaches 3784 lm @ 8.38 V and a power of 277 Watts.
The LED how it looks after turning off at 33 Amps. A little bit of a faint glow shines through the damaged dome:
The dome looked like it is literally exploded in the inside. There are cracks, presumably due to massive heat and burning of the LED chips.
It is interesting how the LED looks without dome and phosphor after the crashtest. Two of the LED chips are simply desoldered itself and came off while removing the dome. The other two have cracks and they also looked like they were melted. I never saw this before in this extent.
3 Thanks
Yeah, you killed itā¦
1 Thank
That is impressively powerful, wow!
How come it didnāt reach even close to the same output as the initial test?
That failure is crazy looking, with the shattered dome.
Good question.
I changed my setup since 2017, with other equipment. But I also have the feeling that this LED simply degraded because it was reflowed many many times to different boards (to test them) and als runs several hours (over the last years) at around 10-20 amps. Also it was quite warm sometimes (estimated 100-130 Ā°C Tj)
It was the little sucker who had not an easy life 
1 Thank