XHP70.2 P2 4000k Output test by Texas_Ace - it's over 9000!! lumens and still going strong!

I posted the results so far in the GT thread and in my Giggles review thread. All results are domed so far. I am debating if I want to slice the dome or not, I really like the tint as it is now and it is a pricey LED lol.

I will mot likely slice the dome though and see what it does after I see the results of the latest focusing.

From the GT thread.

Measured throw in my less then ideal Texas conditions are about 1250m of throw at 5A and a bit over 1300m at 6A with the dome still intact.

I’ve never seen your sphere or test setup. Have you ever posted any pics of it?

Excellent testing TA. Thanks for the effort. What do you think the ideal heatsink for testing would be like?

That’s a whole lotta output!

How long do you let the emitter stabilize between measurements, 30s?

Looks like this LED overclocks pretty well :slight_smile:
I wonder how would it do on LN cooling :slight_smile:

Thanks for the great test Texas_Ace.
It’s really impressive that an LED can handle so many watts and still make it out intact.

Once the price of the XHP70.2 breaks the $8 barrier, budget-oriented brands will start going crazy with their new flashlights.

Impressive results, thanks for the time invested!

I posted a thread awhile back on it here: Texas_Ace integrating PVC sphere with no math involved

Nothing super fancy but has proven itself reliable and consistent, which is the most important part.

A big one lol.

Ideal is a relative term. A better CPU heat sink would do the trick nicely, something without heat pipes and good enough for at least 150W, 200W would be better. The problem is by that point you are usually dealing with heat pipes and that makes drilling and tapping the mounting holes almost impossible.

As a compromise the copper core stock intel heat sinks would work fairly well but man, they are hard to drill and tap. I already tried to do that to one I had.

Water cooling?

:smiley:

Indeed, I was very surprised when the output just kept going up and up and up. It didn’t even drop under 100lm/watt until over 7000 lumens!

I don’t really measure the time between measurements, just do them at a leisurely pace. Most likely around 30 seconds for each one.

Over 10,000 lumens for sure. It would be really impressive if not totally impractical lol.

Is it a full CPU cooler setup with a fan? How about putting the heatsink in a pan of ice cold water? Be careful what with the amps and water not mixing though voltage is low enough. Alternately inverted compressed air can?

This is a good idea, but Matt is not very knowledgeable in the subject. No offense to him. A simple copper water block, a high flow pump using 3/8” lines and a bucket of water should easily handle the heat. The question though is whether you just want to keep the emitter cool or to better simulate real world conditions of a flashlight heating up?

Yes, it is a full stock intel 95W CPU cooler. I also had a 135W stock intel cooler with the copper core but it ate all my small drill bits.

I like to simulate real world conditions to some extent, which is why I was never that worried about getting the biggest heatsink around. Even this test is not something I am particularly bothered about. The cold start tests show what it can do on a cold start but the hot tests are more what can be expected in the real world.

Yeah, using a giant CPU heatsink or AIO cooler should be able to get you those 10k lumens continuously :wink:
Definitely not a “normal” flashlight use case though.

Very interestingly, I sliced the dome on the xhp70.2 in Giggles and the Kcd jumped by over 50%!

I would not have guessed it would gain that much.

It went from ~450kcd with the dome to over 700Kcd with the (badly) sliced dome.

All of this with only ~90w of power, it could do even more if you pushed it.

https://www.ebay.com/itm/5PCS-CPU-GPU-Thermal-Silicone-Grease-Compound-Glue-Heatsink-Plaster-STARS-922-5g/152180587367

I'd use some small dabs of thermal glue among the thermal paste between the heatsink and the led baseplate. This way you can use a massive high performance CPU cooler without worries. To disassemble it help yourself with some alcohol and/or white spirit, can't remember which one did the trick for me right now.

Cheers :-)