LED test / review - Cree XLamp XHP70.2 P2 40E (4000 K) - The second generation of extreme overcurrent and light flux capability?

wow, how far have we gone, 9000 lumen from single emiter

Nice review, Thanks!

Important hint: Luminance values in chart are fixed now. The previously ones are wrong.

@Agro: I don't have a CFT-90-W for testing and I dont't want to buy one of them only for testing, especially for such a high price...

@Jerommel: Thanks for suggestion with lm/W chart. Is noted, follows probably in a later thread with all important values and measurements of well-known LEDs. :)

There is a BLF development fund.
Maybe we could make a research fund as well?

:+1:

Would be awesome to get raw data here too. :slight_smile:

It would be great to see dedomed XHP70.2 test as well….

Like other emitters light flux should be 15 to 25 percent lower than of domed variant. Vf doesn't change, also the overcurrent capabilities. To be honest, I think the great effort for a new test of dd XHP70.2 is not justified.

But raw data are coming very soon. :)

Raw data

Cree XHP70.2 P2 40E (4000 K, domed)

Amps lm Vf
0,20 217 5,29
0,40 414 5,37
0,60 612 5,43
0,80 781 5,48
1,00 964 5,53
1,20 1136 5,57
1,40 1307 5,61
1,60 1472 5,64
1,80 1636 5,68
2,00 1802 5,71
2,20 1959 5,74
2,40 2124 5,78
2,60 2273 5,81
2,80 2430 5,84
3,00 2579 5,87
3,20 2719 5,89
3,40 2860 5,92
3,60 3000 5,94
3,80 3149 5,97
4,00 3281 6,00
4,20 3421 6,02
4,40 3545 6,05
4,60 3678 6,07
4,80 3810 6,09
5,00 3934 6,12
5,20 4074 6,14
5,40 4190 6,16
5,60 4314 6,18
5,80 4430 6,20
6,00 4545 6,22
6,20 4661 6,24
6,40 4785 6,26
6,60 4901 6,28
6,80 5008 6,30
7,00 5116 6,32
7,20 5223 6,34
7,40 5331 6,35
7,60 5438 6,37
7,80 5529 6,39
8,00 5636 6,41
8,20 5744 6,43
8,40 5843 6,45
8,60 5942 6,46
8,80 6033 6,48
9,00 6132 6,49
9,20 6223 6,51
9,40 6306 6,53
9,60 6397 6,55
9,80 6496 6,56
10,00 6579 6,58
10,20 6669 6,59
10,40 6752 6,61
10,60 6835 6,63
10,80 6926 6,64
11,00 7000 6,66
11,20 7074 6,67
11,40 7168 6,68
11,60 7239 6,70
11,80 7309 6,71
12,00 7380 6,73
12,20 7474 6,74
12,40 7544 6,76
12,60 7615 6,77
12,80 7685 6,79
13,00 7765 6,80
13,20 7836 6,82
13,40 7907 6,83
13,60 7977 6,85
13,80 8025 6,86
14,00 8095 6,88
14,20 8143 6,89
14,40 8213 6,90
14,60 8284 6,92
14,80 8331 6,94
15,00 8379 6,95
15,20 8426 6,96
15,40 8473 6,98
15,60 8520 6,99
15,80 8567 7,00
16,00 8615 7,02
16,20 8662 7,03
16,40 8709 7,04
16,60 8756 7,06
16,80 8780 7,07
17,00 8827 7,09
17,20 8851 7,10
17,40 8898 7,12
17,60 8921 7,13
17,80 8969 7,14
18,00 8992 7,16
18,20 9016 7,17
18,40 9063 7,18
18,60 9087 7,20
18,80 9134 7,21
19,00 9157 7,22
19,20 9169 7,24
19,40 9181 7,25
19,60 9205 7,27
19,80 9228 7,28
20,00 9240 7,29
20,20 9252 7,31
20,40 9264 7,32
20,60 9275 7,34
20,80 9287 7,35

If you create diagrams / comparisons with this data or using these for other purposes, I would ask you to publish these charts in this topic and also to specify the source of the data used.

Thanks :slight_smile:
I’ll publish what I have when I’m ready with it.
Though I wonder where should I do it - because I just compare LEDs with each other.

Hey do you know of any XHP70.2 tests with a shaved dome? Would you be able to do one?

In this thread you can see the shaved dome XHP70.2 outperform the XHP35 HI for intensity by about 20%, which I would estimate the XHP to be fairly close to 150-200cd/mm^2 near max power.
But this is just a rough estimate based on the domed -> dedomed increase in lux so it would be great if you could do a proper test of a shaved dome XHP70.2 :slight_smile:

200cd/mm^2 is not as good as the 230 of the CFT90 but at double the lumen output it would still be very impressive.
Especially since it would have more than double the efficiency of the CFT90.

Actually I have barely time to publish new tests, because I will start my new job in two weeks.

I can't promise for any, but I'll see what I can do. :)

(I'm not even sure where my tested XHP70.2 sample is... :/ )

I doubt VOB’s intensity reading. He mentions to take them with a grain of salt. He has the lux meter at the end of a hall, so light bouncing off the walls of the hall reach the lux meter and inflate the reading. That effect would be larger for a larger diameter beam (more light bouncing off the hall walls), so the measurement with the XHP70.2 would be more inflated than with other smaller emitters.

I wouldn’t expect the sliced XHP70.2 luminance in a reflector light to be above 100cd/mm^2.

Oh nice, good luck :slight_smile:

I did not used any driver only use 1 ohm resistance in series
I have tested it and its light is superb to watch it click here

Has anybody ever tried a 90 CRI variant of this LED?
Any idea what the R9 value would be?

Debating between an 80 CRI and 90 CRI…

The tint will probably very bad for the 4000K 90cri variant. The 80CRI ones seem to be much better in this regard.

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 it…
japanese_ogre

1 Thank

That is impressively powerful, wow!

How come it didn’t reach even close to the same output as the initial test?

That failure is crazy looking, with the shattered dome.