Cree XHP70 up to 4022 Lumens and XHP50 up to 2546 lumens - Multi-die leds.

As a consolation I think that 25mm star would not offer that much over the 20mm one. Certainly it would be better, but by the time the heat has flowed to the edges of the 25mm star, it is already on its way in a big way into the aluminum pill.
The closer to the LED you have copper, the greater the benefit.

Now having said that, if there is a 25mm copper star, I want one :wink:

dchomak, the idea was to spread out the contacts to clear his reflector. More copper couldn’t hurt, of course, but some lights have too flat a base on the reflector, like the HD2010 which is legendary for this problem.

As usual, I didn’t read his post carefully enough.

Yeah, the HD2010, I found out the hard way :_(
Luckily, on start up with the driver I had, it went into moonlight and all I blew was the 7135

DOHC20, the thing is that the XHP-70 is not made for flashlights and is only recently starting to show up in some. The folks that make DTP mcpcb’s make em by the 10,000’s, without a large demand for these large emitters in flashlights they’re not in a hurry to get monies tied up designing and producing such an animal.

MaxToch might upon request, but they’d want to see interest in at least 500 or so. SinkPAD, well, good luck with that. I can try talking to them but it really doesn’t seem like a large market, it’s much easier to cut a bevel on a flat bottomed reflector and clear the 20mm star.

Surely someone is capable of making these for the forum in a batch run. I tried to make one but cant get my head around the pcb software it realy hurts my head :~
I know the engineers at my work would be able to make it without battering a eyelid but getting them to do it for me is a different story. Maybe if i get time ill see if they can teach me how to use the software and i could try a design of my own. Fingers crossed.




If the price is right you could easily sell a healthy batch here. I know I would take some. I would be even more interested in the purchase of DTP 16mm boards for XHP-70

a question for the Pros….

how much lower Lumen will a N4 3B XHP70 give compared to a 1D ?

i get with my 3B around 4100 Lm @ 8A (in a SD75) can that be true??

Hey MM,

Driven to around 8 amps I typically get around 4500 OTF lumens at 1 min using N4 bin XHP-70s

The 3B, 1D etc makes no difference in terms of actual lumen output. Visually a cool white will typically "appear" brighter than a neutral outputting the same. As long as the output bin is the same "N4" you will get somewhere in that range.

I would say yes that you probly are getting roughly 4100 our of your SD75.

Were you expecting something else, more/less?

Thanks!

i hoped for 4500-4700

but mayby my way to measure is not good…
my 4100 recalculated by 1,15 (because a 1000 Lumen PD35 shows 1150 Lumen in my box)
-> the meter showed 4750 Lumen

… but the 50cm styrofoam sphere arrived today - hopefully my Lumen guestimates will be more accurate in a few weeks :wink:

Yes, there is a huge margin for error when measuring. Even with a "calibrated" device things like ambient temp can sway the measurement. My sphere seems to measure slightly lower than what some others here get.

People testing for say ansi type spec will recalibrate their device each time it is used with a $500-$1000+++ dollar calibration bulb/device.

What would these be like in a C8 ?

A portable handwarmer! :bigsmile:

It all depends on the setup.
You will need to use 2 18350 cells in series, so don’t expect huge runtimes. Or you could use a boost driver with a 18650, but then you probably can’t run the led at a high current.
Also keep in mind that these XHP/multi die leds have a ‘shadow’ in the middel of the hotspot with a smooth reflector.

I’m planning to put a XHP50 in a C8 with a op reflector but that’s only an idea at the moment…

I bought a C8 host from Richard at Mountain Electronics with his build service and a XHP-50 and Zener-mod driver. It is definitely impressive! But, the smooth reflector does make a donut hole in the middle of where the hotspot should be. Using an Op reflector would help that. If you have a SMO reflector and want to fix the beam, you could use Old Lumens’ trick of spritzing a little bit of clear-coat on the reflector to make it semi-orange-peel. Or, some DC Fix on the lens would also smooth it out. The donut-hole was not a problem with the one I bought, for what it was going to be used for, so I didn’t do anything about it.

Can you measure spectrums of these XHP70 ?

Hi guys, where can I buy 4 xhp50 12volts maybe neutral tint mounted in 20mm copper star? And another question; Can I drive four of them 12volts in parallel with 4 x 18650 in series? Thanks

Hi Chang,

I have a few 12V boards I can install XHP50s on. I would not suggest direct driving them on 4 cells though. I do that sometimes with XHP70s, but that would probly drive 50s a bit too hard. If you used a resistor to drop a little of the voltage it would be ok.

Matt

Great, thanks for the advice…

How much can you charge me for 4 of those? Do you have the leds also?

Thanks

If you want bare mcpbs I have them here.
http://asflashlights.com/mcpcbs/11-sinkpad-copper-mcpcb-for-cree-xm-l2-xh-p-50.html

If you would like them with the emitters on them those are here.
http://asflashlights.com/xhp-50-xhp-70/38-cree-xhp-50-j4-2b-5700k.html

I do not have the 12V boards listed on the site, however you can check out with 6V boards and just leave me a message and I will send 12V

For the XHP70, has anyone actually measured the current from power source (not the LED, would it differ though?) when it’s luminosity at maximum, 4022lm or close to that? I assume it’s more than 2.4A, which the datasheet says.

Was wondering if a XHP70 running say 12v 2A for an hour+ melt a TIR lens like the ledil CN10861_IRIS?