XHP-35

Or: http://www.tmart.com/Lenser-P14-LED-Flashlight_p236578.html with 4 x 14500.

Not sure how that’s applicable Fritz. A plastic light is a bad idea for high output, and we need 4 cells in series to get over the 12+A draw of the XHP-35. What am I missing?

Than how about this one with 14500’s in series max say 1.5 amps. http://www.illumn.com/flashlights/other-brands/starry-light-sa-22-880-lumens-4-x-aa.html For those of use with pockets.

That one might just work, but I’m not sure what it would gain. If it’s doing 800+ lumens to start with and you swap in a XHP-35 at or under 1.5A then you would only gain, in theory, a few hundred lumens. Almost not enough to be able to see it. And it wouldn’t be easy, most likely.

What about the Convoy L4? You can get an extension tube for it, run 4 18350’s and the reflector is nice enough that it should put out a surprising beam. The light has a tail clicky for lock-out, a side e-switch for modes, so while it wouldn’t be exactly easy it will take Neven’s LD-2 (I know this because I put an LD-1 in the L4)

So, while the XHP-35 is showing an impressive potential, it’s rapidly becoming apparent that it will take a rare set of conditions in a host to properly utilize it. The Fenix TK series has stackable tubes with carriers, so the carrier could be modified to 4S and a second tube also modified would extend run time. With that huge reflector (even though it’s plastic) this emitter should really rock!

i hope i can finish my build the next days….

i don’t want to tell to much early because if i fail… :wink:

I bet the Starry Light SA-22, 4 X AA with HD XHP-35 top bin LED might push out 2000+ lumens on a 1.5 amp driver.

This is a P series, not L, so it is aluminum except for the battery holder. It takes 4 x AA cells, so 4 x 14500 would fit.

It comes with an XR-E, probably why it is offered for this price. So it is no harder putting an XHP-35 and 14500s in it than to put an XM-L2 or XP-L and AAs. The mechanical driver should work as is, or one could change the resistor values. It is about half as compact as 4 x 18350, but 14500 is a more common cell size.

The cells are parallel though, running a single cree emitter. We need series for 16.8 volts, not parallel for 4.2V. Not saying it can’t be done, but it’ll be a dang sight more difficult than swapping in an XM-L2.

The P14 is 4 s AA for 3V to the LED and 3V for stray and driver resistances.
So the same holder will take four 14500s in series to give a nominal 14.8 V, or 16.8 at full charge. 14.8 nominal minus 12 nominal leaves 2.8 V for stray and driver resistance.
My replacement XP-L came today, so I may have more on the P14 soon.

Very interesting, there weren’t any pics or much of any information so I couldn’t see how they were making that work.

I built my second XHP-35 this evening. And this one is a sweet light, if it holds up. Again, I used the LED4POWER LD-2 driver, with 250KOhms on the right hand resistor at the cell choice set-up and mode 2 soldered. I didn’t use moon on this one, so it’s 3 levels. The 1M resistor is changed to 2M, the stock 180KOhm sense resistor was left in place.

With 4 Efest IMR18350 Purple cells it shows 3.10A at the tail, and the lightbox reads…

327.75 lumens
976.35 lumens
2363.25 lumens

302.75Kcd for 1100M throw.

The host? Olight M2X UT Javelot. :slight_smile: It had an extension tube and the 4 Efests fit right in so I took a chance. lol It’s not as tight a beam as the de-domed XM-L2 was, but it is still a nice beam profile and I’m about to head outside to check it out, just finished it.

I hope it keeps working because the driver is JB Welded to the contact board and totally engulfed, filling all available space in the driver cavity and it went in curing so if it fails the light will be trash.

Great output for LED size.

Dale, if you have time could you possibly also run an XML2 controlled test at a few different check points?

I ran some tests with the emitters in my setup the way it was designed to hold them, and also got higher numbers than with my first test ( although the dead fall remained the same). In any case if I could get a bit more data to compare to it would be helpful.

If you dont have time or what ever I understand though :)

I have a question:

is this led driveable with a normal 12v led driver (700ma)? like the one for the 10w COB?

Can the XHP-35 HI outperform a Dedomed XP-G2 in throw in a aspherical setup ?

i think if lumen per mm2 are higher - i think hope so

die is bigger, but lumens are higher…
but on my phone its pita to search numbers :wink:



I guess it depends on what you mean by out perform. Surface brightness= Lux in this case if all other factors are the same. Its been my experiance that with an aspherical set up when you go to a larger die provided both LEDs are top bin (ie roughly the same surface brightness) that you get about the same lux, but with a larger hot spot and more lumens.

For example if you have a top bin XPE2 and a top bin XPG2 both driven to the emitter max in the same light you will get only slightly more lux ( if any) from the XPG2 than the XPE. However you will get a larger hot spot at the same distance and more lumens.

So if the XPE2 is performing at 179,000 lux you will get a very similar number with the XPG2.


The only reason I would thing you stand to gain any lux in an aspherical setup with the XHP-35 is that is comes on the SC5 platform which your XPG2 does not, so over all surface brightness with this emitter driven to max would most likely be higher.

I have not completed testing with this yet so I have no apples to apples yet though.

Dale,

One more question. Do you happen to have a lux reading on the one you did with the courui reflector?

I only held the Courui reflector over it by hand, didn’t put one in a Courui. I was just looking to see how the different reflector design would affect performance as the reflector in the SN50 is one of those styled for the Luminus SST-50 and not really advantageous for a throwy style emitter. The deeper Courui big head reflector tightened up the beam profile considerably, so in a thrower light this emitter makes more sense.

I don’t have a bench power supply so I don’t really have a way to run numbers on efficiency and output at the different current levels.

i plan to wire the unburnt LD-2 (2S configured) to the middle of the 4 cells getting 8.4 V and only wiring the LED to 16.8 V.

lets see how that works

after that i choose reflector or lens