The There Are No Stupid Questions Thread

[Scallywag]

@Tom E

I don’t have a NarsilM light here to test it with, but here it goes:

Wait.

You don’t have a NarsilM light to test with? Aren’t you the creator?

[Tom_E]

@Scallywag

@Tom E

I don't have a NarsilM light here to test it with, but here it goes:

Wait. You don’t have a NarsilM light to test with? Aren’t you the creator?

At work, not home. But I don't program lights/modded lights with NarsilM anymore - use my special version of Anduril now .

I swore at one point I'll never flash firmware again where I can't calibrate voltage and temp from the UI, so now that I modified Anduril to calibrate voltage, and extend temp range, and display a simple version #, I'm pretty happy with it as a NarsilM replacement.

[Lightbringer]

@Tom E

But I don’t program lights/modded lights with NarsilM anymore - use my special version of Anduril now

Wow, that’s like letting your own kids sit at home playing with wrapping paper while you take the neighbor’s kids to the park.

[Agro]

BU-808: How to Prolong Lithium-based Batteries

Energy Cells, which most consumer products have, should be charged at 1C or less. Avoid so-called ultra-fast chargers that claim to fully charge Li-ion in less than one hour.

[Tom_E]

[raccoon]

@dustinkjocz

I need your thoughts on this: Website

Do you think the shirts there are cool?

I didn't even follow the link.

Do I think you're an obvious spammer?

[Lightbringer]

@dustinkjocz

I need your thoughts on this: “Website” [redacted]

Do you think the shirts there are cool?

Ewww, they suck! I wouldn’t even let a crack-ho wear one of those shirts. :confounded:

[xevious (Gary)]

So what’s the deal with OSRAM LED emitters? I’ve seen some growing enthusiasm for them. Looks like at least some models are ideal for throw. Are there any current production flashlights OSRAM emitters worth considering with ?

[Agro]

@xevious

So what’s the deal with OSRAM LED emitters? I’ve seen some growing enthusiasm for them. Looks like at least some models are ideal for throw.

That’s precisely the case - there are several LEDs that throw significantly better than any other LEDs which understandably causes a lot of enthusiasm.

[jeff51]

I can’t help myself…
Lowani under two moons.
Sokath! His eyes uncovered!

And for something completely different.
Lord knows what nether regions yon digit has erstwhile probed.

[xevious (Gary)]

@Agro

@xevious

So what’s the deal with OSRAM LED emitters? I’ve seen some growing enthusiasm for them. Looks like at least some models are ideal for throw.

That’s precisely the case - there are several LEDs that throw significantly better than any other LEDs which understandably causes a lot of enthusiasm.

Thanks for the link! I’m looking forward to seeing how these progress. Are there any production hosts using them with notable success?

[CNCman]

Here is a stupid question. ” If a XHP 70.2 led is tested for lumen output here on BLF to 8.5K lumens @ 12v and 8 amps ( not sure if accurate ), Can a big flashlight like the GT check 10.5K lumens ” ??

I am trying to verify a lumen tube for accuracy.
Any help is appreciated.

[JasonWW]

@CNCman

Here is a stupid question. ” If a XHP 70.2 led is tested for lumen output here on BLF to 8.5K lumens @ 12v and 8 amps ( not sure if accurate ), Can a big flashlight like the GT check 10.5K lumens ” ??

I am trying to verify a lumen tube for accuracy.
Any help is appreciated. :question:

It all depends on the tube and its calibration. Some people have gotten 8.5K, but it was not with Maukka calibrated reference sources. It is very hard to find the right calibration. Depending on your calibration you can make it whatever output you want.

With my 6 volt Convoy L6 with Lexel FET and P1 bin 5700K xhp70.2 with Aspire 4300mah cells it pulled 19.6 amp / 5500 lumen at 1 second and 18.4 amp / 5250 lumen at 20 seconds. This is out the front which includes losses from the reflector and lens.

With a bigger light like the GT you go from 2 x 26650 to 8 x 18650 so it can pull a bit more amperage due to less voltage sag. Instead of 19 amp it can in theory do 21 or 22 amps. Because the output curve of the 70.2 as nearly maxed out, you only see a tiny bit more of output.

So it’s possible to get more output. Especially between a med size light and a big light. For example if my L6 drew 15A and a GT drew 19A. Then you might see a bigger jump in output.

As far as calibrating a Lumen Tube, you need a proper reference source. Every Led varies in output even with the same bin and you don’t always know the details of how it was measured in the first place.

So based on a Maukka calibration source, your 8.5K and 10.5K are way too high. Even for a raw led.

[CNCman]

Thanks for the explanation JasonWW.
I also have Maukka calibrated lights and 3 different lumen tubes. The problem I’m having is with big lights that are reading low in all 3.

For example I tested a MT09R at 29.8 amps in a 6 inch tube calibrated with Maukka calibrated lights it checked 14500 lumens. Should that number be around 22K to 25K ? it will burn paper and it has a TA driver.

My 8 inch lumen tube is calibrated with a MT07S with a xhp 35 HI @ 2700 lumens. It reads 24K lumens on the MT09R but also gives 9800 lumens on another light that should be around 8600 lumens. The 6 inch tube is ok for less than 2K from what I’m seeing. Maybe the various beam patterns is the problem.

[Scallywag]

@JasonWW

With my 6 volt Convoy L6 with Lexel FET and P1 bin 5700K xhp70.2 with Aspire 4300mah cells it pulled 19.6 amp / 5500 lumen at 1 second and 18.4 amp / 5250 lumen at 20 seconds. This is out the front which includes losses from the reflector and lens.

I still think your numbers are low. ~20A in 6V XHP70.2 should be getting close to 7000 lumens, especially on a cold start. There are losses for “OTF lumens” but I wouldn’t expect it to be over 15%

[JasonWW]

@Scallywag

I still think your numbers are low. ~20A in 6V XHP70.2 should be getting close to 7000 lumens, especially on a cold start.

According to who? Why do you think this?

@Scallywag

There are losses for “OTF lumens” but I wouldn’t expect it to be over 15%

I think most OTF losses are between 25 and 35 percent.

[JasonWW]

@CNCman

For example I tested a MT09R at 29.8 amps in a 6 inch tube calibrated with Maukka calibrated lights it checked 14500 lumens. Should that number be around 22K to 25K ? it will burn paper and it has a TA driver.

My 8 inch lumen tube is calibrated with a MT07S with a xhp 35 HI @ 2700 lumens. It reads 24K lumens on the MT09R but also gives 9800 lumens on another light that should be around 8600 lumens. The 6 inch tube is ok for less than 2K from what I’m seeing. Maybe the various beam patterns is the problem. :weary:

You should ask TA. He tested these same lights so he has a good database.

[JasonWW]

@Scallywag

I still think your numbers are low.

Maybe it is related to the Lumen Tube diameter? I have the small Tube. If I had a bigger diameter maybe the higher output lights would read differently? Maybe Maukka needs a higher output calibration light to sell?

All the professionals use large integrating spheres. This is the standard. There could be flaws in the idea of using a Lumen Tube. Maybe the use of 3 diffussion sheets is too many or not enough? Maybe the beam shape does influence the output? IDK. The tubes are way cheaper to build and seem to do a pretty good job.

I considered building a 1 meter sphere to test lights in, but it’s expensive, takes up a lot of space and I’m not that interested. I would not put all my faith in lumen numbers. Also, some people’s numbers I trust more than others. Amp draws are still a pretty good reference point in my opinion.

[xevious (Gary)]

Considering all specifications & performance, which flashlight would you choose & why?

• Lumintop GT Mini Pro XHP50.2 (1)
  * 3500 Lumens, 480m throw
  * 18350 or 18650 battery
  * NarsilM
  * Cost: $49.95

• Lumintop FW21 Pro XHP50.2 (3)
  * 100000 Lumens, 325m throw
  * Anduril
  * 18650 or 21700 battery
  * Cost: $69.95

[JasonWW]

@xevious

Considering all specifications & performance, which flashlight would you choose & why?

Choose what works best for your needs.