BLF style 18650 1s thrower( poor mans Olight M2X)

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luminarium iaculator
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Anthon wrote:
XP-G2 S4 2B

And then it also depends which XP-G2 S4 2B Smile Really I am not kidding you here. New is super bad and you should avoid and put XM-L2 or XP-L or if you have good old one than you are good to go in breaking candela records Wink

Anthon
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luminarium iaculator wrote:
Anthon wrote:
XP-G2 S4 2B

And then it also depends which XP-G2 S4 2B Smile Really I am not kidding you here. New is super bad and you should avoid and put XM-L2 or XP-L or if you have good old one than you are good to go in breaking candela records Wink


Is there a way to know if it’s one of the new or the old ones? I bought it from mtn
Jerommel
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Probably new, the old ones are sold out everywhere.

You can recognise the old ones by the die.
They have relatively smooth phosphor and the grid of dots are visible.
The new ones have more rough phosphor and you can hardly see the dots.

Looking for:

5” parabolic reflector (for recoil light)

(I’ll be back around the 28th)

gastonpatagonico
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Hello, could you tell me what variant of xp-g2 is? I can not get better photography, I have one placed in UF1504, with driver BLF A6 runs at 4.7 amps with fresh cells, greetings!

Sorry to place large size so it can be viewed!

Anthon
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I’ll try this night with the xpg2 that I just dedomed, if I don’t like the results I’ll take the XP-L way

Jerommel
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Looks like a new one, i can’t see the grid of dots

BY THE WAY:
I got a FAKE XM-L2 in this light. Sad

Looking for:

5” parabolic reflector (for recoil light)

(I’ll be back around the 28th)

Anthon
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I got 240.000cd with dedomed xpg2, on maxtoch 26mm mcpcb and fet driver. Cell wasn’t fully charged, I’m going to try again in a while

DB Custom
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gaston, you might want to consider putting a percentage in your photo selection, that pic is blown off even my 24” monitor…

Dale

luminarium iaculator
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DB Custom wrote:
gaston, you might want to consider putting a percentage in your photo selection, that pic is blown off even my 24” monitor…

Yes please resize mentioned pic and that is is new s42b

Edit: Or any new G2… I should not tell that it is new s42b but it surely looks like that.

gastonpatagonico
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Edit Beer If I perform continuity test with multimeter, led lights up and you can see many small points, as these are concerned to differentiate old xp-g2 s4 b2 from new ones? regards

luminarium iaculator
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We should not spam the thread so you got plenty of info on that here

gastonpatagonico
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Thank you luminarium iaculator, I am reading, sorry for the deviation, I have host on the way analyzing which led to use, xp-g2, xpl hi v3 3c or xml-2 u4 1a, greetings and thanks again.
luminarium iaculator
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Please report further results! I am also hooked badly on this reflector light although I still much prefer aspheric lights.

gastonpatagonico
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Unfortunately, the orders take at least 2 months here, will have to wait quite …….
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Has somebody measured the (inside) diameter of the reflector openings?

With those I could calculate some throw figures.

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Ok, I now know the the diameter of the large opening, 52mm. The unused portion at the bottom seems to be around 15mm.
So the size of the reflector is 1948mm^2 as seen from the hotspot.

Under perfect conditions with good Osram Black Flat at 4.5A (250cd/mm^2) and a UCLp lens when turning the light on 425kcd should be possible (5-10% less after heating up). Of course this requires a linear oder Buck Driver (2S) and a lot of time and money.

With de-domed XP-G2 S4 2B (old, good one) at 4-5A (around 180cd/mm^2), FET-driver, normal glass lens and heated up maybe around 276kcd.

luminarium iaculator
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Interesting…
I never liked to many calculations and frankly speaking I really hate math. But I also know that plenty of engineers and scientist are on this forum so I really feel like a redneck among this guys Smile

But it would be interesting to know such calculations. BTW you talk about de domed xpg2s42b, and I am not sure that any of us have proper equipment for measuring cd/mm 2 so I just wondering how reliable that measured 180cd/mm 2 is?

Anyway I am still waiting 26mm mcpcb and I will report about old XP-G2 S4 2B performance although I did tested them and it seems that 4.4A(or lower) is max with curent batch of 9 pcs I have and with fet driver.

I expect at least 280-300. But as I said I will report when my pcb’s and new lux meter arrives.

luminarium iaculator
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The_Driver wrote:
Under perfect conditions with good Osram Black Flat at 4.5A (250cd/mm^2) and a UCLp lens when turning the light on 425kcd should be possible (5-10% less after heating up). Of course this requires a linear oder Buck Driver (2S) and a lot of time and money.

Djozz tests are always Holy Bible to me. But I guess in his test of mentioned emitter he probably did not got the best one. So I am very intrigued now. Cause this is obviously new thrower king… Tiny (dd XP-E2 size) but obviously working.

So another question is what kind of current draw we can expect if we use a FET driver with it? Djozz did direct drive mode but what is the difference if I use artic alumina as insulator and fet driver?
I really don’t understand… That why I will ask you guys Smile

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180 is based on a reliable, measured value at 3A (145-151cd/mm^2). So I adjusted it for a higher current (same as with lumens, see djozz tests). But of course, it is not perfectly precise because with FET drivers the current changes all the time. So here it is just a ballpark figure.

The 250cd/mm^2 of the Osram is also a reliable measurement, it might actually be a little higher bcause not alle the optical losses of the test setp where accounted for. So this value just shows what is definitely possible. Not all Black Flats will be this good. Some might be worse, some might be better.

EasyB
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The_Driver, has the luminance of the dedomed XPG3 been measured?

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EasyB wrote:
The_Driver, has the luminance of the dedomed XPG3 been measured?

Yes, here. sma measured an XP-G3 S5 @5.05A with and without dome (he shaved the LED with a shaving blade and some silicon lubricant).
With dome: 88cd/mm^2
shaved: 186cd/mm^2
So it’s actually much better than people think. Especially if one takes into account that it can be driven at much higher currents.

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The_Driver wrote:
EasyB wrote:
The_Driver, has the luminance of the dedomed XPG3 been measured?

Yes, here. sma measured an XP-G3 S5 @5.05A with and without dome (he shaved the LED with a shaving blade and some silicon lubricant).
With dome: 88cd/mm^2
shaved: 186cd/mm^2
So it’s actually much better than people think. Especially if one takes into account that it can be driven at much higher currents.


I did a similar measurement of the bare die and got similar results. The problem is when the dedomed XPG3 is actually put in a flashlight (reflector or aspheric) the resulting lux is much lower than the dedomed XPG2. See some measurements on this thread: http://budgetlightforum.com/comment/958351#comment-958351

I still don’t understand the discrepancy between the different measurements (in and out of a flashlight). See here for some discussion: http://budgetlightforum.com/comment/1050599#comment-1050599

But the fact is that no one has modded a light with the dedomed XPG3 that throws nearly as well as the dedomed XPG2, even with the increased current (lower Vf) of the XPG3.

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The problem here is that we don’t know how those people built their lights (maybe the focus was off?). We don’t know how they de-domed their LEDs (maybe they didn’t remove enough silicone or maybe they damaged the phosphor). We also don’t know how consistent the luminance is after de-doming (probably not a problem though).
Maybe sma made a mistake in his measurement.

So in the end we don’t really have enough real evidence either way. I can say that sma has a lot of experience with luminance measurements and that in the past his measured values pretty much always correlated with measured throw of different lights.

I think the problem is that a few people tried this LED and then wrote negative things and everyone else gave up.

Also a lot of people have started building unregulated lights with FET drivers. This poses the risk of damaging an LED when turning on a light because the startup current can be extremely high when using these new low-Vf emitters.

Controlled tests must in my eyes be done with constant current.

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Interesting points. Thumbs Up

Would be nice if a “how to” topic was here about ‘shaving’ modern LEDs.

Looking for:

5” parabolic reflector (for recoil light)

(I’ll be back around the 28th)

EasyB
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The_Driver, those are plausible explanations. I would love for the XPG3 to meet or beat the XPG2, but I’m doubtful. There are several examples of experienced modders getting similar underwhelming performance results with the XPG3.

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I did extensive testing on the XP-G3 when it first came out, with MEM assisting. I found it to not meet the capabilities of the XP-G2 in a reflectored light although MEM found promise with aspheric builds.

I do not like the beam profile from the G3, domed or sliced or de-domed, so I don’t use it.

Dale

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Very interesting. MEM really believed that XP-G3 will kick ass but than he disappeared.

This is his de domed emitter(yes he even managed to perfectly dedome G3) tint comparison test in reflector light http://budgetlightforum.com/node/47088

Or to make it short I will put interesting pics from his thread:

XP-G2 dedeomed

XP-G3 dedomed

DB Custom
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See what I mean though? The blueish purple aura and odd spill color? I don’t like that, so I don’t use it. Not fond of the XHP-50.2 either, for similar reasons. Will eventually pull the three from my scratch built light and go with something else.

Dale

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Back about 3 years ago, when the HD2010 was giving me these problems, I did this to solve clearance issues. Made it easy to dial up the focus without worrying about touching electrical contacts…

Dale

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I was looking at this pic some days ago…

I really want to try this , but seems tricky of course Wink

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