Help upgrade my 2x18650 Berg xhp50 light

jarkko2410 · 2019-01-04T18:28:56.000Z

wow suddenly the light goes off… battery empty ? we shall see

MascaratumB · 2019-01-04T18:52:52.000Z

If those are “fake” cells (as Lexel mentioned) with fake advertised capacity, they will not hang on for very long times! Also, 2200 mAh cells are far from having great capacity. The 18650 cells with more capacity have around 3500mAh (so there is a big difference, that translates in the runtime they will give you.

About getting hot or not…that driver doesn’t push the LED to the limit, resulting in the low output you are getting. If the driver pushed the LED more it would get hot within few seconds.

A better driver and better cells will give more output and more heat!

jarkko2410 · 2019-01-04T19:07:01.000Z

well, thats what I want

maybe I measure the amps its using on the 100% level … if its really low, maybe there is a reason to upgrade it to

reasonable light…

I don’t want to push this over its limit, but like Said before… its not heating almost at all, so there should be some nice window for the upgrade ?

jarkko2410 · 2019-01-04T19:10:30.000Z

could someone calculate from the driver pics, that what should it give through ?

here is the pic link again :

ImgBB

IMG-20190104-134349 hosted at ImgBB

Image IMG-20190104-134349 hosted in ImgBB

Lexel · 2019-01-04T19:20:06.000Z

With reasonable low resistance like in a good light the XHP50 should draw 4-5A with good batteries with those 3 resistors

But looking on all pictures this light is so much junk you should sell or return it and get a proper light

Astrolux MF02 for example will get you tons of throw, 02S decent with a lot more lumens, even if the specs are too optimistic

jarkko2410 · 2019-01-04T19:26:55.000Z

Where is the crying face ….

jarkko2410 · 2019-01-04T20:29:07.000Z

So the loading time was about 2h from empty to full ….

thats with mini usb type phone charger … capacity guess ?

Yokiamy · 2019-01-04T21:09:59.000Z

I would recommend a Convoy L6, stock light is great and you can upgrade it later on.
You can find great deals on this light with M4DM4X on banggood or gearbest, but you need a separate charger and cells.

Or from Simon Mao’s official Convoy AliExpress store, (https://www.aliexpress.com/store/330416?spm=2114.12010615.0.0.2d3e6c6eLVsYnE , he gives BLF members discount (if you ask for it))

Otherwise there will be enough people over here who can recommend a great light with usb charging possibilities.

jarkko2410 · 2019-01-04T22:45:02.000Z

So the loading time was about 2h from empty to full ….

thats with mini usb type phone charger … capacity guess ?

around 1Ah someone mentioned

and 100% power on ( if dropped, turned back to 100% ) battery lasted about 40min .

so its working full gas 1.6- 1.7Ah ?

jarkko2410 · 2019-01-04T22:56:20.000Z

how much is that in lumens ? 1000 ? 1200 ?

I was hoping from this point to get it around +2A maybe 2.5A but not more… thats enough…

to get it around the promised lumens 1900-2000lm ?

What needs to be done ?

Yokiamy · 2019-01-05T08:36:40.000Z

The easiest way is to use a replacement driver. Kaidomain sells a lot, or BLF member Lexel his Texas Avenger drivers, but for that you definitely need new cells.
As said earlier, probably you’d be better off buying a decent flashlight.

Lexel · 2019-01-05T08:49:23.000Z

Yokiamy:

The easiest way is to use a replacement driver. Kaidomain sells a lot, or BLF member Lexel his Texas Avenger drivers, but for that you definitely need new cells.
As said earlier, probably you’d be better off buying a decent flashlight.

replacement driver wont do anything this light is already almost DD
the many resistances on all those parts simply eat up the battery voltage, also the battery itself drops in voltage under load a lot

here an example of a Samsung 30Q vs some Ultrafire cell
at 0.2A the UF cell seems acceptable in capacity
but at only 3A this changes dramatically the UF cell barely drops to like no capacity

on a flashlight this means the voltage drop results in a massive drop in current, this explains that the light does not get hot
those cheap lights are depending often on a crappy battery to stay within a current that does not kill the LED

Yokiamy · 2019-01-05T08:55:30.000Z

Edit, never mind.
Good explanation Lexel

jarkko2410 · 2019-01-05T09:34:53.000Z

Ok. So with High drain battery the led is gonna die fast ?
In seconds, or in minutes ?

Maybe I test this… Lol .

What about those normal good batteries ? Still minutes and dead ?

Im thinking to buy the MF02 …
That looks good light to me

Yokiamy · 2019-01-05T09:44:01.000Z

You need 4 x 18650 cells for the MF02, the xhp35 only does 2500 Lumen max.

XHP35 output and death test + PWM efficiency test by Texas_Ace Flashlight Modding and DIY Parts

Ok, another installment of the LED test series, think this is the last of the test I have done so far. Thanks to KawiBoy1428 for donating the LED’s for testing! First up we have the best output test from an undamaged high bin LED. Click any image to see it larger [image] [image] This next test is of a low bin 90cri HD version and the goal with this one was to see if it could handle an FET driver at full power and what the efficiency was like at lower levels. It only looses 11% efficiency a…

I think you’d better get a Q8 for less. (Around 50usd, with discount)
Or a convoy L2 with XHP50

jarkko2410 · 2019-01-05T09:51:56.000Z

Damn… Have to look these also.

Im gonna go to local shop to get good 18650 batteries do explore the light…

jarkko2410 · 2019-01-05T19:11:19.000Z

Friend gave me samsung normal 18650 batteries…
Everything same. Working fine, same lumens.

Well a little brighter… After test shots…

Lexel · 2019-01-05T14:00:12.000Z

Sofirn SP36 or Q8 are very good budget lights
really good quality and brightness
very useful allrounder in medium distances

MCPCB current depends a lot which material used to build, top is best lowest is bad
Copper DTP
Aluminum DTP
modern aluminum ultra thin aluminum-oxide layer
copper with thin ceramic glue insulation layer
aluminum with thin ceramic glue insulation layer
copper with polymer glue insulation layer
aluminum with polymer glue insulation layer

the bad news is the worst is cheapest to produce

Yokiamy · 2019-01-05T15:35:27.000Z

Or THIS one ?
Thinking of one myself, really a good price for such a XHP50 light with the discount

Lexel · 2019-01-05T15:40:19.000Z

any decent light will likely out throw your Berg
even with half the lumens a XPL Hi in a 4-5cm wide reflector thrown pretty good