Nice review. What does a c8 do (LUX wise) with a boost HL and boost HX

And also what is the LES (light emitting surface) of this new cree XP-P?

https://budgetlightforum.com/comment/1768377#comment-1768377

LES is 1.05mm*1.05mm, so 1.1mm².

On a lm/mm² basis, it should underperform 1mm Osrams by a measurable margin and be a near match to PM1s. But real world results are what really matter in the end.

I’m curious what numbers you get with NM1 in the same host as this XPP sample.

JaredM wrote:

I’m curious what numbers you get with NM1 in the same host as this XPP sample.

everydaysurvivalgear wrote:

If i remember correctly the Osram KW CSLPM1.TG does around 168kcd in a C8 i think. The smaller Osram KW CSLNM1.TG was doing just under 200kcd in a C8 i don't have it any more as focus was rubbish. When using the 3030 centering ring both the CSLNM1.TG and XP-P perform worse than using a 3535 centering ring.

Isn’t XP-P 3535 emitter?

If so, no wonder you have focus problem

The osram emitters are thinner than most, so they require a thinner gasket. Early 3030 gaskets like ones I sourced from mountain where waaayy too thick. With the HHL532, which is an even lower profile chip, usually tunes in at 0.40mm IIRC in convoy reflectors. So try 0.60mm and sand slowly from there

Looks like Cree is introducing these in all CCT and CRI options based on their data sheets which is amazing. I have yet to find a place to buy warm white 90 cri variants.

Very interested in the high CRI versions, especially the 5700K.

Inspired by all the testing above (and beam shots, love a good beam shot!) i just did a very quick, very crude test to measure an XP-P against a CULNM1 (4040 1mm2) in a Cometa. My interest is for lower current lights, especially single AA, and especially those with custom 3535 MCPCBs.

The Cometa was already setup with the CULNM1 being powered by an L4P LD-4 driver, i set the driver to 4A and took measurements for modes 3, 4 and 5, then swapped in the XP-P and repeated the measurements.

Tailcap current measured the same for both LEDs with a fully charged battery so i tested with one at a 3.88V to get an idea of the real world effect of the XP-Ps higher Vf.
With one exception (XP-P on max) the currents provided were the same with both batteries, and i have assumed the lux would stay the same too.

Lux readings were taking at a random but importantly consistent distance (around 5m) so are for comparison between the LEDs only.

With 3.88V battery voltage:

Mode 3:
CULNM1: 0.375A – 1840cd
XP-P: 0.375A – 2060cd (12% increase)

Mode 4:
CULNM1: 1.177A – 4700cd
XP-P: 1.177A – 4910cd (4.5% increase)

Mode 5:
CULNM1: 3.97A – 11100cd
XP-P: 3.52A – 7760cd (31% decrease)

Battery voltage at end of test: 3.87V.

Mode 5 repeated with 4.15V battery voltage:
XP-P: 3.97A – 8000cd by the time i measured but dropping rapidly, down to about 6500cd in 30 seconds.

In mode 5 i think the XP-P suffered from serious heat sag, i didn’t use thermal paste and it’s possible the retaining ring wasn’t putting enough pressure on the MCPCB for proper heat transfer. (The current remained the same.)
So it’s possible the XP-P has more to give at 4A but given JaredM’s measurements and the effect of the higher Vf i would still expect it to underperform the CULNM1 at 4A.

Up to 1.177A though, with a 3.88V battery in this test it outperformed the CULNM1 which is enough to make me look at further testing at lower currents, maybe up to 2A.

Marc E wrote:

Very interested in the high CRI versions, especially the 5700K.

Inspired by all the testing above (and beam shots, love a good beam shot!) i just did a very quick, very crude test to measure an XP-P against a CULNM1 (4040 1mm2) in a Cometa. My interest is for lower current lights, especially single AA, and especially those with custom 3535 MCPCBs.

The Cometa was already setup with the CULNM1 being powered by an L4P LD-4 driver, i set the driver to 4A and took measurements for modes 3, 4 and 5, then swapped in the XP-P and repeated the measurements.

Tailcap current measured the same for both LEDs with a fully charged battery so i tested with one at a 3.88V to get an idea of the real world effect of the XP-Ps higher Vf.
With one exception (XP-P on max) the currents provided were the same with both batteries, and i have assumed the lux would stay the same too.

Lux readings were taking at a random but importantly consistent distance (around 5m) so are for comparison between the LEDs only.

With 3.88V battery voltage:

Mode 3:
CULNM1: 0.375A – 1840cd
XP-P: 0.375A – 2060cd (12% increase)

Mode 4:
CULNM1: 1.177A – 4700cd
XP-P: 1.177A – 4910cd (4.5% increase)

Mode 5:
CULNM1: 3.97A – 11100cd
XP-P: 3.52A – 7760cd (31% decrease)

Battery voltage at end of test: 3.87V.

Mode 5 repeated with 4.15V battery voltage:
XP-P: 3.97A – 8000cd by the time i measured but dropping rapidly, down to about 6500cd in 30 seconds.

In mode 5 i think the XP-P suffered from serious heat sag, i didn’t use thermal paste and it’s possible the retaining ring wasn’t putting enough pressure on the MCPCB for proper heat transfer. (The current remained the same.)
So it’s possible the XP-P has more to give at 4A but given JaredM’s measurements and the effect of the higher Vf i would still expect it to underperform the CULNM1 at 4A.

Up to 1.177A though, with a 3.88V battery in this test it outperformed the CULNM1 which is enough to make me look at further testing at lower currents, maybe up to 2A.